Abstract: An electronically controllable brake actuating system for automotive vehicles includes a master brake cylinder operable by an actuating pedal and having at least one piston, at least one braking pressure generator actuatable by an electronic control unit, to which braking pressure generator wheel brakes of the vehicle are directly connected and which is connectable to the master brake cylinder by hydraulic connections closable by valve assemblies, at least one sensor device to identify the driver's wish for deceleration, and a simulator chamber which interacts with the master brake cylinder. The reliability of the system may be improved by providing a simulator chamber that is connected to a hydraulic chamber and which is bounded in the master brake cylinder by a second piston, by way of a closable connection.

Abstract: A method of controlling the operation of an electrohydraulic brake booster to achieve a desired pedal feel. The method includes sensing brake pedal movement from a fully retracted rest position before a significant resistance to travel of the brake pedal is developed. The method further includes generating a command pulse that results in application of pressurized hydraulic fluid to the boost piston assembly sufficient to overcome preloaded spring forces and seal friction in the boost piston assembly that would otherwise tend to resist further brake pedal travel. The method further includes providing a control signal override when a brake pedal "bounce" condition is detected to avoid undesired vehicle braking. A brake pedal bounce condition may occur if the brake pedal is released suddenly so that the brake pedal returns to the fully retracted rest position rapidly enough to bounce off of a mechanical stop at that position and move in the brake apply direction.

Abstract: A secondary source of braking for large hydraulically braked vehicles utilizing the available power source (38) provided by typically available anti-skid and traction control braking systems. The invention improves the time response of a secondary braking traction control system by utilizing stored fluid in the low pressure anti-skid braking system accumulators (34) to provide for faster build of pressure by the pump motor (38). Fluid is stored and utilized based on vehicle behavior and operational states and is based upon the principal the traction control, anti-skid braking and secondary braking requirements are generally mutually exclusive. This allows for a decreased response time of the secondary braking system and also provides for improved initial cycle response of typical traction control events that utilize the system configuration.

Abstract: The invention relates to an electronically controllable braking system for motor vehicles with a brake pressure generator unit (2) which can be actuated by a brake pedal (1), which supplies hydraulic fluid via a hydraulic fluid path (3) to at least one wheel brake (4) of the motor vehicle, a first electromagnetic valve arrangement (5a, 5b) which is arranged in the hydraulic fluid path between the brake pressure generator unit (2) and the wheel brake (4) for controlling the pressure build-up, pressure relief and pressure holding phases in the wheel brake, a motor-powered controllable hydraulic pressure source (7) which, in addition to or in lieu of the brake pressure generator unit (2), supplies hydraulic fluid to the wheel brake (4), and a motor-powered controllable auxiliary energy source (15, 30) which boosts an actuation of the brake pressure generator unit (2) by the brake pedal (1) or which effects an actuation of the brake pressure generator unit (2) in lieu of the brake pedal (1), with the controllable

Abstract: When a vacuum booster fails, an pressure amplifying mechanism increases a wheel brake pressure. After that, even when it is detected that the vehicle is brought into a stopped state, the state in which an increased brake fluid pressure is applied to wheel cylinders is held. If a condition for terminating control to maintain a stationary state of the vehicle is satisfied, that is, if a predetermined time period has elapsed since when the vehicle stops, the operation of the pressure amplifying mechanism is stopped to reduce the wheel cylinder pressure.

Abstract: A plurality of electrical fluid pressure control valves or a plurality of groups each comprised of a plurality of electrical fluid pressure control valves are operatively associated with respective power supply replays. The electrical fluid pressure control valves and a plurality of electrical switch valves are connected in parallel to a power source. A plurality of failure sensors are associated with the respective electrical fluid pressure control valves or the respective groups so as to detect whether an electrical system failure in any one of the electrical fluid pressure control valves or the groups occurs. If occurs, failure control unit is operable to control a corresponding one of the power supply relays so as to cause a corresponding one of the electrical switch valves to selectively connect a corresponding one of the wheel cylinders to a master cylinder.

Abstract: An actuating device for a brake system of a vehicle a housing and at least one piston slide positioned in the housing for loading the brakes with a pressure medium. The brake system has brakes for the vehicle wheels and a control unit connected to the brakes for sending control signals to the brakes. The brakes are supplied via brake lines with the pressure medium and have wheel sensors connected to the control unit. The wheel sensors determine the rotational velocity of the vehicle wheels during a braking operation and send a signal related to the rotational velocity to the control unit. At least one piezoelectric element is positioned in the housing of the actuating device for actuating the at least one piston slide. The at least one piezoelectric element is connected to the control unit of the brake system.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston for defining the pressure chamber behind the control piston. The control piston is moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure. A valve assembly is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston, and adapted to supply the regulated pressure into the power chamber to assist the operation of a brake pedal.

Abstract: An electronically controllable anti-lock brake actuation system for automotive vehicles, including a pedal actuated dual-circuit master brake cylinder, and braking pressure generators actuatable by an electronic control unit. Each of the braking pressure generators has a piston slidable in a cylinder bore from an initial position, each piston separating a first working chamber, to which each one wheel brake of the vehicle is connected directly and the master cylinder is connected by way of a closable hydraulic connection, from a second working chamber and is connected to the master cylinder where the stepped piston is operable to achieve a braking pressure generation or boosting.

Abstract: A pneumatic/hydraulic pressure intensifier has a cap secured to open end of housing. A first chamber in open end receives air pressure. A first fluid communication system formed in cap communicates air pressure to first chamber. A wall member is disposed in such housing. A second chamber in communication with first chamber contains hydraulic fluid and unpressurized air. A second cap is secured to other end of housing. A third chamber in intensifier contains hydraulic fluid. A second fluid communication system formed in second cap connects the third chamber to a fluid communication line. An aperture formed in wall of second chamber evacuates air from portion of first and second chambers upon communication of air to a second portion of first chamber and communication of air to the first and second chambers upon evacuation of air pressure. A second aperture, formed in another housing wall, communicates hydraulic fluid to second chamber. A first piston is disposed for reciprocal movement in the first chamber.

Abstract: A back-up power assisted braking system substitutes an intermittently actuated secondary source of pressurized hydraulic fluid such as a traction control/anti-lock pump and motor (41) for the normal braking power assist upon the detection of a failure in the primary power assisted braking system. A failure may be detected in responsive to sensing simultaneous brake pedal (23) displacement and a lack of fluid flow for providing an abnormality signal. Also, a failure may be detected by sensing a predetermined difference between the commanded braking force (45) and the actual braking forces (38, 49). There is a pressure transducer (45) which provides an indication of brake pedal commanded braking force and a hydraulic circuit (43, 53 or 55, 51) interconnecting the secondary source outlet, the individual wheel brake actuators (14) and secondary source inlet.

Abstract: An integral power booster and master cylinder assembly interactively operates with a braking system to effect conventional braking operation, anti-lock brake operation, traction control operation and stability enhancement system functions in a cost effective manner. The incorporation of a low pressure hydraulic booster provides a manner of enhancing first cycle response times of the traction control and stability enhancement system functions. Fluid separation is maintained between the stability enhancement system and the braking channels through the use of a pump priming accumulator to provide a pre-charge to the wheel brake pressure effecting pump assembly, in direct response to the power booster.

Abstract: A power-assisted brake system which can be activated by a pedal including a travel simulator and a desired value transmitter which is coupled thereto and a second sensor which can be used alternatively as a desired value transmitter. The second desired value transmitter is a pressure transmitter. The signals of both desired value transmitters are monitored in an electronic control unit for essentially corresponding signal values. If there is an unacceptable difference in signal value, power-assisted braking operation is suppressed. Braking is then possible by an emergency brake cylinder. The power-assisted brake system can be used for motor vehicles for passenger transport and goods transport, in motor vehicles which are equipped with an anti-lock brake system (ABS) or with a traction control system (TCS).

Abstract: A vehicular brake booster using fluid pressurized by a hydraulic power steering system hydraulic pump. Fluid pressure is controlled by using a pressure regulator in the pump output and by electronically switching fixed orifices in a boost developing valve controlling fluid flow within the power steering system. Additional control is effected by electronically opening and closing apply and relief valves controlling fluid flow respectively to and from a brake power booster for differing periods.

Abstract: A vehicle brake system with a hydraulic brake booster. A booster pressure which is required for operating the brake booster is produced by throttling a flow of pressure medium which is supplied by a pump. For this purpose, a throttle valve is arranged between a pressure line which is connected to the pump and a return line which leads back to the pump, the adjustment of said pressure valve involves a building up of booster pressure in the pressure line by a solenoid, which booster pressure is applied to the brake booster. An electronic control unit which is connected to at least one sensor which outputs variable electric signal serves to control the throttle valve, the sensor detects activation of the brake pedal. For example, a pressure sensor which as a function of the boosting pressure supplies signals to the control unit which is developed to form a pressure controller and controls the throttle valve can be connected to the brake booster.

Abstract: The invention is directed to a pressure control apparatus in a vehicle braking system which has a wheel cylinder operatively mounted on a wheel, a reservoir for storing an amount of brake fluid, and a master cylinder for receiving the brake fluid from the reservoir and generating a master cylinder pressure in response to depression of a brake pedal. The pressure control apparatus includes a housing which defines therein a pressure chamber which communicates with the wheel cylinder, and a control device which is actuated by a current fed thereto for providing a set pressure in response to the current and regulating the pressure in the pressure chamber into the set pressure.

Abstract: An automotive hydraulic braking system includes a pivoted brake lever coupled to a master hydraulic cylinder assembly which in turn is coupled by a brake line to a plurality of hydraulically actuatable calipers. A mechanical brake pressure intensifier is provided in-line between the master cylinder and the calipers. Pedal travel is controlled according to a developed formula to approximate preestablished industry standards set for conventional vacuum-assisted hydraulic braking systems.

Abstract: A pressure boosting device as used in a vehicle brake system or other hydraulically operated system wherein the boosting device is connected to a mechanically operated pressure regulator for producing a manually controlled pressure, an electrically controlled pressure regulator and a hydraulically operated actuator, and includes a booster piston for boosting an electrically controlled pressure produced by the electrically controlled pressure regulator so that the boosted pressure is applied to the actuator, and a valve mechanism having an open and a closed position which are established when the booster piston is placed in its original position and moved away from the original position, respectively. In the open position, the actuator communicates with the mechanically operated pressure regulator. In the closed position, the actuator is disconnected from the mechanically operated pressure regulator, to permit the booster piston to boost the electrically controlled pressure.

Abstract: A master cylinder for use in a brake system having an anti-spin apparatus to provide traction control for the drive wheels of a vehicle. The brake system has a pump responsive to an input from the anti-spin apparatus for directly drawing fluid from a reservoir into the brake system through a separate valve located in a pump compensation port connected to a pressurizing chamber of the master cylinder.

Abstract: A hydraulic brake system operates so that under anti-lock control, the braking forces for the rear wheels are enhanced in order to reduce braking loads for the front wheels. Further, upon the occurrence of a malfunction of the anti-locking control, the hydraulic pressure which is supplied to the front and the rear wheels is equalized in order to prevent the rear wheels from locking. In preferred embodiments, a small hydraulic pressure is supplied from a master cylinder to the front wheels while a large pressure is supplied from a brake booster to the rear wheels. Due to the large fluid pressure, the braking forces of the rear wheels are enhanced so that the rear wheels might tend to lock easily. However, anti-lock control can be performed effectively in order to avoid the rear wheels from locking. Upon the malfunction of the anti-lock control, a switching valve is operated so that the brake pressure which is supplied to the front and the rear wheels is equalized.

Abstract: A fluid pressure type booster device is capable of feeding an output pressure of a fluid pressure source in a controlled manner by permitting a slide member to slide so as to balance the force acting in an advancing direction by a fluid pressure of a pressure chamber in accordance with an operation of an operating member and the reaction force of a reaction chamber. The device includes an input piston slidably fitted in a housing to define the pressure chamber between the input piston and an interlocking member, a spring mounted in a compressed manner between the input piston and the interlocking member, and an on-off valve interposed between the pressure chamber and the fluid tank so as to be closed in accordance with an advancing movement of the input piston with respect to the interlocking member by an amount not less than a predetermined value.

Abstract: A brake control system for an automotive vehicle has an improved hydraulic circuit network which is capable of performing pressure boosting operation for a pressure supplied from a master cylinder, as well as anti-skid brake control operation and traction control operation. The system includes a valve device for selectively establishing and blocking fluid communication between master cylinder and wheel cylinder. The valve device is generally responsive to the fluid pressure supplied from the master cylinder to enter into pressure boosting mode in response to increase in the fluid pressure from the master cylinder across a predetermined value. An electronically operable boost control device cooperates with the valve device for varying pressure boosting magnitude depending upon vehicle driving condition.

Abstract: A hydraulic braking pressure control system includes a shut-off valve (4) which is provided in an oil passage (58) connecting a brake device with an output port in a master cylinder and which is brought into a closed state by a control circuit when a braking operation is detected by an operation-amount detector, and a locking device (5) for inhibiting the closing of the shut-off valve when the output hydraulic pressure from a hydraulic pressure supply source in equal to or less than a predetermined value. The shut-off valve is opened when there is no braking operation, thereby ensuring that even if a hydraulic pressure is delivered from a hydraulic pressure control valve when there is no braking operation, such hydraulic pressure can be released into a reservoir.

Abstract: A brake assembly with hydraulic boosting, comprises at least one disk brake having a fixed part (1), a caliper (3), a brake motor (82) actuated by a fluid under pressure, a master cylinder (48) and a device (15) for recovering the energy dissipated during braking. The device (15) comprises at least one energy-recovering cylinder (21) with its piston (19) which is associated with the fixed part (1) and with the caliper (3) and the working chamber of which is connected fluidly to the brake motor (82). A hydraulic booster/limiter is connected between the energy-recovering cylinder (15) and the brake motor (82), the hydraulic booster/limiter being controlled by the pressure of the fluid generated in the master cylinder (48).

Abstract: A hydraulic dual-circuit brake system for a road vehicle with front-axle/rear-axle brake circuit division has a tandem main cylinder as a brake device. The primary output pressure space of the cylinders is associated with the front-axle brake circuit, and the secondary output pressure space of the cylinders is associated with the rear-axle brake circuit. A pressure modulator adjusts the front-axle/rear-axle braking force distribution in the direction of an approach to the, in each case, ideal braking force distribution, as a braking-pressure actuator for the rear-axle brake circuit. The pressure modulator has a drive pressure space, by the charging of which with the output pressure of an auxiliary pressure source under solenoid valve control, a braking pressure which can be coupled into the rear-wheel brakes can be built up in an output pressure space of the pressure modulator.

Abstract: In a known anti-skid control system having a brake booster, a servo piston is followed in the actuating direction by a restoring piston. After a partial stroke, the servo piston can reach the restoring piston and displace it. This arrangement is disadvantageously long. In the brake booster proposed here, a restoring piston is displaceably disposed inside the guide bore. This piston has a bottom and bordering on its a cylinder wall open toward the brake pedal. This wall forms a cylinder jacket in which the servo piston is displaceable. The servo piston executes a part of its working stroke at a variable distance from the bottom of the restoring piston. From the time of contact with the restoring piston, the servo piston executes a further working stroke together with the restoring piston, if necessary.

Abstract: A hydraulic brake pressure generation apparatus which is provided with a pressure increasing valve apparatus, a fluid pressure increasing apparatus and a power valve. The pressure increasing valve apparatus receives a fluid pressure in a fluid pressure chamber of a master cylinder and then generates a fluid pressure the force of which is larger by a predetermined amount than the fluid pressure in the fluid pressure chamber.

Abstract: Disclosed is a brake fluid pressure control apparatus in which an anti-lock control mechanism is connected to a hydraulic booster. A large-diameter piston is combined with a small-diameter piston so that the pressurization effected by the master cylinder M/C can be augmented by virtue of the difference in diameter between these pistons before it is transmitted to the wheel cylinder W/C. By moving forwards, the pistons cause a fluid supply passage between the fluid pressure source and a wheel cylinder W/C to be opened. With this structure, the size and weight of a brake fluid pressure control apparatus can be reduced.

Abstract: A brake control has a regulator valve to establish the pressure in the brake system during brake apply. A flow regulator valve permits a fast flow rate for filling of the system when brake apply is initiated and a slow flow rate when the brake system pressure approaches the value established by the regulator valve.

Abstract: A hydraulic braking system for an automotive vehicle is provided with a power source for generating a hydraulic power pressure, a master cylinder, a hydraulic booster for introducing the hydraulic power pressure and actuating the master cylinder in response to operation of a brake operating member, a wheel brake cylinder for braking a road wheel, a changeover valve, and anti-skid control device for actuating the changeover valve into a position where the wheel brake cylinder is communicated with the booster and regulating the hydraulic pressure in the wheel brake cylinder on the basis of the hydraulic power pressure in the booster when the road wheel is in a slip condition.

Abstract: A system and method for regulating a brake pressure in a brake chamber by a master brake cylinder piston, this master brake cylinder piston is associated with a brake pedal and piston rod that are acted upon by a braking force. When the brake pedal is actuated with a braking force, the master brake cylinder piston is simultaneously placed under pressure as a function of the pedal travel, and covers a longer travel than the brake pedal and piston rod.

Abstract: A hydraulic braking system capable of reducing the brake pedal stroke is provided by adding to the basic hydraulic braking system. The adding system is able to selectively execute the reduction of brake pedal stroke and, at the same time, capable of selectively adding anti-lock function and anti-slip function by including the changeover valves or opening and closing valves to the system. An auxiliary hydraulic pressure generator having a power hydraulic pressure source and regulator is interposed in the hydraulic conduit of at least one circuit, and an outlet port of the regulator is communicated to the wheel cylinders for connecting to the hydraulic conduit of the circuit.

Abstract: In a hydraulic braking pressure control system comprising an auxiliary hydraulic pressure generator connected to a brake device for generating a hydraulic pressure depending upon a braking operation by a brake pedal; a supply source; a supply source pressure control device controlling the pressure from the supply source in accordance with the braking operation by the brake pedal; pressure transmitting device interposed in a hydraulic pressure path extending from the supply source via the supply source pressure control device to the brake device arranged to permit the transmission of the hydraulic pressure output from the supply source pressure control device to the brake device when the hydraulic pressure in the supply source is normal and to cut off the flowing of a working fluid from the brake device toward the supply source when the hydraulic pressure in the supply source is abnormally reduced; and an on-off valve interposed between the auxiliary hydraulic pressure generator and the brake device, having a

Abstract: A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a hydraulic booster for actuating the master cylinder in response to depression of a brake pedal and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicating with the master cylinder and a second group of wheel brake cylinders communicating with the hydraulic booster. An auxiliary cylinder is disposed between the master cylinder and the first group of wheel brake cylinders to which a hydraulic braking pressure from the master cylinder is directly applied in its inoperative condition, and it increases the hydraulic braking pressure in response to depression of the brake pedal in its operative condition which is made when the hydraulic power pressure, for example, is less than the hydraulic braking pressure by a predetermined difference.

Abstract: A fail safe control for a brake unit with an integral hydraulic brake booster for a road vehicle with a hydraulic dual-circuit braking system having a static front-axle brake circuit and a static rear-axle brake circuit connected respectively to primary and a secondary outlet-pressure space. The primary outlet-pressure space is delimited, by a piston element of the primary-piston arrangement and is in constant communicating connection with a second part space which is delimited by a secondary piston and by two piston elements which are displaceable relative to one another. One of these two piston elements is designed as an annular piston and the second as a plunger piston. A yoke-shaped first axial-force transmission element couples the primary piston with only one of the two piston elements.

Abstract: A vehicle hydraulic braking system for applying the wheel brakes of an automotive vehicle comprising: a reservoir for holding a hydraulic brake fluid; a pump fluidly connected with the reservoir for pressurizing the fluid; at least one first valve fluidly connected with the pressurized fluid from the pump and the first valve being connected with a modulation sump, the first valve delivering a modulated brake pressure to at least one wheel brake at a ratio of the master cylinder pressure to the wheel pressure so long as the fluid pressure from the pump is above a predetermined value; and a second valve fluidly connected with the wheel brake, the master cylinder, the modulated brake pressure, and with the pump and, whereby the second valve isolates the master cylinder from the wheel brake when the pump pressure is above a predetermined value delivering modulated pressure to the wheel brake and when the pump pressure is below a predetermined value the second valve connects the master cylinder with the wheel brak

Abstract: A resettable booster is disclosed including a booster chamber in communication with a resetting chamber through a closable connection. For pressure relief of the master brake cylinder, valves are switched so that the booster piston is pressure-balanced and the master brake cylinder force shifts the booster piston back into the brake release position. The pressure fluid is supplied from the booster chamber into the resetting chamber. Advantageously, the volume intake of the booster is small, hence allowing the use of an extremely simple pressure source construction. The pressure source is a cylinder with an accumulator chamber that is confined by a piston, wherein the piston is moved by the difference in pressure between the atmosphere and the vacuum in the intake side internal-combustion engine of the vehicle.

Abstract: A braking apparatus for a vehicle has a booster for receiving, as a pilot pressure, a pressure of a master cylinder and for regulating a pressure from an auxiliary pressure source to a level predetermined times the pilot pressure. The booster is provided with an initial pressure raising mechanism for causing the booster to output a predetermined initial pressure in response to an initial actuation of a brake pedal.

Abstract: A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a regulator and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicated with the master cylinder and a second group of wheel brake cylinders communicated with the regulator. The regulator has a housing defining therein a regulator chamber for introducing the hydraulic power pressure thereinto from the power source and regulating the hydraulic power pressure into a regulated hydraulic pressure in response to the hydraulic braking pressure generated in the master cylinder, and which is positioned in substantially coaxial relationship with the master cylinder and responsive mechanically to depression of a brake pedal.

Abstract: The device comprises a tandem master cylinder, a booster high pressure fluid distributor, 2, a valve mechanism 4 to interconnect the master cylinder and the distributor selectively to a braking circuit. The high pressure circuit is connected to the pipeline 46 which controls the plungers 52, 56 acting on the ball valves 50, 51 respectively. In the event of failure of the high pressure circuit,the valves 50, 51 connect the pipeline 26 directly supplied by the master cylinder and the pipeline 5 which supplies a brake motor 8 for a wheel. The device may be utilized in an anti-skid circuit.

Abstract: A hydraulic booster including a power piston, a booster chamber for applying a boost pressure to the power piston, an input rod, an intermediate inlet chamber for introducing a power source pressure thereinto, a valve mechanism provided in a valve chamber of the power piston and a differential pressure regulating valve subjected to a valve opening pressure equal to a sum of a spring pressure and a pressure of the boost chamber and a valve closing pressure equal to a pressure of the intermediate inlet chamber so as to control opening and closing of a communicating path for introducing the power source pressure into the intermediate inlet chamber such that pressure of the intermediate chamber is kept higher than the pressure of the boost chamber by a predetermined value at all times.

Abstract: A hydraulic brake system includes a master cylinder for generating a brake fluid pressure in response to a brake pedal, a power fluid source for generating a power fluid pressure by increasing a brake fluid to a predetermined pressure. A dynamic fluid pressure control apparatus supplies the brake fluid pressure to regulate the power fluid pressure from the power fluid pressure source in response to the brake pedal. A plurality of wheel cylinders of each wheel for the vehicle are fluidically communicated with a dynamic fluid pressure control apparatus and the master cylinder via a fluid passage separated into plural control systems.

Abstract: In a brake system for automotive vehicles comprising a master cylinder, wheel cylinders and a device for anti-lock control, the piston of the master cylinder is positioned in its nominal position by the variable volume of delivery of a pressure fluid source, in particular, a pump. The actual position of the piston is determined by a sensing device which is mounted on axially movable parts of the tandem master cylinder, booster, pedal assembly or other elements. The volume of delivery of the pump is adjusted so as to cause the piston of the master cylinder and, thus, the brake pedal to assume the desired position. For this purpose, the pump is connected with the pressure chamber of the master cylinder. Advantageously, it will be accomplished thereby that the brake pedal will not depress through its full travel when, during the control mode, more pressure fluid is removed from the hydraulic system, in particular from the pressure chamber of the master cylinder than the pressure fluid pump is able to deliver.

Abstract: An automatic drive slip regulating unit for motor vehicles or the like which communicates via a connecting line with at least one brake line between a master brake cylinder and an anti-skid system with wheel brakes connected downstream. The connecting line is intended to discharge into a cylindrical chamber of an additional master cylinder, and the cylindrical chamber is intended to be variable by a plunger that is subject to the pressure of a spring-supported spring reservoir plunger. To return this spring reservoir plunger to its terminal position, for instance in the event of leakage or upon termination of the drive slip regulation, the spring reservoir plunger is to be subjectable on its other side to a pressure medium which derives from a separate low-pressure hydraulic circuit.

Abstract: A manually/electrically operated brake system for applying a brake to a wheel of a vehicle, including a master cylinder operated by a brake operating member, to generate a manually controlled braking pressure according to an operation of the brake operating member, a wheel brake cylinder for applying a brake to the wheel, a primary fluid passage for connecting the master cylinder to the wheel brake cylinder, an electrically controlled pressure generating device for generating an electrically controlled braking pressure to produce a required braking effect determined based on at least one of an operating force and an operating stroke of the brake operating member, and a switching device provided in the primary fluid passage, for applying the electrically controlled braking pressure to the wheel brake cylinder while disconnecting the master cylinder from the wheel brake cylinder when the electrically controlled pressure generating device is normally functioning, and for applying the manually controlled braking

Abstract: A brake system with anti-lock control and traction slip control is disclosed. The system includes a braking pressure generator composed of a master cylinder and a brake power booster. Also provided is an auxiliary-pressure supply system which generates an auxiliary pressure proportional to the pedal force for anti-lock control and generates an uncontrolled predetermined auxiliary pressure for traction slip control. The wheel brakes of the front wheels are connected to the master cylinder. By way of valve assemblies, the auxiliary-pressure supply system is connected to the wheel brakes of the front wheels in the control phases. The rear-wheel brake circuit is designed as a dynamic circuit and is fed directly by the auxiliary-pressure supply system.

Abstract: A hydraulic brake system for automotive vehicles has a master brake cylinder connected to an unpressurized reservoir and a brake line connected to a working chamber of the master brake cylinder and leading to pressure control valves of a brake slip control device. The pressure control valves are followed by wheel brake cylinders. The working chamber of the master brake cylinder is connectible to a pressure medium source upon the starting of the brake slip control device. The outlet pressure of the pressure medium source lies above the maximum braking pressure achievable by applying the master brake cylinder. The working chamber's front side (away from the first master cylinder piston) is sealed by a second master cylinder piston sealedly arranged within the master cylinder. The second master cylinder piston is sealed relative to the master cylinder by a non-return valve gasket.

Abstract: A brake pressure control unit operable by a hydraulic brake power booster and functionally corresponding to a tandem master cylinder for two statically pressurizable brake circuits has two casing bores spaced laterally apart. In one of the bores, the primary output pressure space bounded by the primary piston and floating piston is accommodated, and in the second bore, a piston which is also a floating piston, bounds the secondary output pressure space by a piston flange. The floating piston bounding the primary output pressure space on one side has the effect of building up, in the end control pressure spaces of the first and second bores, the control pressure acting on the second floating piston. This pressure leads to a displacement of the second floating piston in the sense of a pressure build-up in the secondary pressure space. The second floating piston is connected to a double-acting hydraulic cylinder, which is likewise accommodated in the second casing bore.

Abstract: In a hydraulic brake system for a vehicle of the kind comprising a fluid pressure source having a reservoir and a hydraulic booster having a power piston arranged to receive the pressure fluid of a control fluid chamber which is proportional to a stepping down force on a brake pedal, a normally open type valve is disposed in a fluid passage provided for returning the pressure fluid of the control fluid chamber to the reservoir and is arranged to close in response to a braking pressure retaining signal produced when the vehicle is stopped by brake application.

Abstract: A brake slip control apparatus fed with auxiliary energy for use in a vehicular hydraulic brake system, comprising a master-cylinder assembly (12) actuatable by the brake pedal, and with auxiliary energy being supplied into the working chamber (16) of the master cylinder. A resetting piston (49) is arranged axially slidably between stops on the secondary side of the master cylinder piston (23), which piston (49) causes the master cylinder piston (23) to assume a defined position in the event of application with auxiliary energy. To this end, the resetting piston (49) is slidably supported in an annular chamber (47) and, on brake actuation after having overcome a clearance (X), is entrained by the booster piston (57) in the actuating direction. Terminating into the annular chamber (49) is a throttle bore (46) through which pressure fluid out of the annular compartment (36) may enter into the annular chamber (47) in order to urge the resetting piston (49) back to its initial position.