Abstract: A system for and a method of controlling driving of a continuously-operable electronic vacuum pump includes determining conditions for allowing and disallowing first and second electronic vacuum pumps to operate for each braking situation according to vehicle state information associated with braking. The first and second electronic vacuum pumps are driven individually or concurrently according to the determined braking situation. Thus, an optimal negative pressure optimal suitable for the vehicle state information is easily supplied to a booster.

Abstract: A method and system for management of a vacuum pump connected to a braking system of a motor vehicle, and use of an electronic control unit connected to the vacuum pump. At least one differential pressure threshold associated with the vacuum pump, selected from a first differential pressure threshold controlling stopping of operation of the vacuum pump, a second differential pressure threshold controlling starting of the vacuum pump, and a third differential pressure threshold, lower than the second threshold and signalling alerts representative of operating faults, is determined by taking into account a first set of data representative of the detection or otherwise of a repetitive braking situation and/or a second set of data representative of altitude of the vehicle.

Abstract: A method for controlling a flow of air includes establishing a level of vacuum in a booster device by generating the flow of air from the booster device using a pump. The method also includes determining whether the level of vacuum in the booster device has reached a predetermined value. The method additionally includes terminating the flow of air from the booster device when the level of vacuum in the booster device has reached the predetermined value. A system for controlling a flow of air according to the method may be incorporated into a motor vehicle having an internal combustion engine that is adapted to drive the pump.

Abstract: Provided is a braking control system including: an internal combustion engine serving as a power source of a vehicle; a brake servo unit operated by a negative pressure supplied thereto; a passage configured to supply an intake negative pressure of the internal combustion engine to the brake servo unit; and a negative pressure pump configured to generate a negative pressure by being driven by power transmitted from a wheel of the vehicle and transmit the generated negative pressure to the brake servo unit, wherein the negative pressure pump is driven so as to supply the negative pressure to the brake servo unit during execution of inertia running in which the internal combustion engine stops and the vehicle runs by inertia.

Abstract: In a method of controlling a brake system, a basic control to operate an electric vacuum pump is performed when a booster internal pressure, i.e., an actual pressure of a negative pressure chamber of a brake booster, is larger than a target booster internal pressure, i.e., a target pressure in the negative pressure chamber. The electric vacuum pump is not operated under a predetermined condition even when the booster internal pressure is larger than the target booster internal pressure.

Abstract: A brake system for a vehicle having a VIS actuator of an intake manifold, a vacuum pipe connected to the VIS actuator, and a vacuum pump connected to the vacuum pipe may be provided, which includes a vacuum hose having one end connected to the vacuum pipe to generate additional negative pressure, wherein the vacuum hose may be connected to a vacuum chamber. The brake negative pressure may be supplemented without increasing the capacity of the vacuum pump to improve the braking performance.

Abstract: A vehicle controlling system includes an engine serving as a power source of a vehicle; an electric storage device; an assist device that assists an operation of a driver by consuming power from the electric storage device so as to operate a running device that changes the running condition of the vehicle; and a starting device that consumes power from the electric storage device so as to start the engine, wherein the starting device automatically starts the engine based upon a physical quantity concerning the engine, and the start of the engine is inhibited while the assist device operates the running device, when the execution of an inertial running in which the engine is stopped to allow the vehicle to run with inertia.

Abstract: A brake system includes: a first passage connected to a negative pressure chamber of a brake booster; a second passage branching from the first passage; an electric vacuum pump in the second passage; a first check valve for preventing inflow of a fluid from the intake system to the negative pressure chamber through the second passage; and a second check valve for preventing inflow of a fluid from the intake system to the negative pressure chamber through the first passage and inflow of a fluid from the intake system and a discharge outlet of a pump part to a suction inlet in the pump through the first passage, wherein a filter is provided between a discharge outlet of the pump and the intake system.

Abstract: An apparatus for supplementing a brake vacuum pressure may include an engine control unit (ECU) that generates a vacuum pressure control signal for supplementing the brake vacuum pressure in accordance with the result of determining whether the brake vacuum pressure is included in a reference vacuum pressure range after a vehicle implements an ISG process, a sub-oil pump that is operated in accordance with a control signal from the ECU to supply hydraulic pressure to the inside of an automatic transmission after the vehicle implements the ISG process, a vacuum pump that generates and supplies the brake vacuum pressure to a brake system, and an electronic clutch that selectively couples the sub-oil pump and the vacuum pump to allow driving force of the sub-oil pump to be transmitted to the vacuum pump or to be cut, in accordance with whether the vacuum pressure control signal is sent thereto.

Abstract: The invention relates to a brake actuation unit for a motor vehicle brake system, a vacuum brake booster and a motor pump unit which is provided for supplying a vacuum and comprises a pump connected to the vacuum brake booster and an electric motor driving the pump. According to the invention, an additional sound absorbing element is provided in the connection between the vacuum brake booster and the pump in order to lower the sound level in the vehicle interior.

Abstract: An electric motor system that triggers brake and steering function upon engine failure featuring an electric motor; and a vacuum pump, an oil pump, and a sensor each operatively connected to the electric motor. The vacuum pump is connected to the vehicle's brake servo and the oil pump is connected to an oil reservoir and to the vehicle's steering sector. The sensor is adapted to detect when the engine is turned off. When the engine is turned off the sensor is activated and causes activation of the electric motor. Activation of the electric motor causes activation of the vacuum pump and the oil pump. The vacuum pump functions to provide a vacuum in the servo brake of the vehicle and the oil pump functions to create oil pressure with oil in the oil reservoir and direct oil pressure to the steering sector.

Abstract: A brake system provided with a brake booster using intake negative pressure of an engine for boosting a brake operating force for a vehicle. A requested braking force is detected base on an operating amount of a brake pedal, and when the requested braking force is less than a threshold value, a master cylinder pressure prevailing in the master cylinder using an operating force boosted by the brake booster is supplied to the wheel cylinder. On the other hand, when the requested braking force is greater than or equal to the threshold value, brake fluid pressure having been boosted by a pump is supplied to the wheel cylinder. The threshold value is set to a value that becomes greater the larger the negative pressure inside the brake booster.

Abstract: A system for supplying vacuum to a vacuum consumption device of a vehicle is disclosed. The system includes an electrically driven vacuum pump selectively routing air to an air intake system upstream and downstream of a turbocharger.

Abstract: A brake system for a vehicle having a VIS actuator of an intake manifold, a vacuum pipe connected to the VIS actuator, and a vacuum pump connected to the vacuum pipe may be provided, which includes a vacuum hose having one end connected to the vacuum pipe to generate additional negative pressure, wherein the vacuum hose may be connected to a vacuum chamber. The brake negative pressure may be supplemented without increasing the capacity of the vacuum pump to improve the braking performance.

Abstract: Provided is a braking control system including: an internal combustion engine serving as a power source of a vehicle; a brake servo unit operated by a negative pressure supplied thereto; a passage configured to supply an intake negative pressure of the internal combustion engine to the brake servo unit; and a negative pressure pump configured to generate a negative pressure by being driven by power transmitted from a wheel of the vehicle and transmit the generated negative pressure to the brake servo unit, wherein the negative pressure pump is driven so as to supply the negative pressure to the brake servo unit during execution of inertia running in which the internal combustion engine stops and the vehicle runs by inertia.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, including a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly includes a logic module and a power module, which are arranged separately of each other.

Abstract: The present invention relates to a brake booster device for a vehicle brake system comprising a force input element, a control valve arrangement actuable via the force input element, a chamber arrangement disposed in a housing and comprising a vacuum chamber and a working chamber, which is separated from the vacuum chamber by a movable wall and connectable selectively to a vacuum source or the atmosphere, and a force output element, wherein the movable wall is biased into a normal position by a resetting spring accommodated at least partially in the housing and wherein the housing is penetrated by at least one fastening bolt. In this case, it is provided that at least one damping element acts for the purpose of vibration damping on the resetting spring, wherein the at least one damping element is mounted on the at least one fastening bolt.

Abstract: A control apparatus for a negative pressure generating apparatus that includes an ejector that generates a negative pressure whose magnitude is larger than that of a negative pressure to be taken from an intake passage in an intake system for an internal combustion engine provided in a vehicle; and state change means for making the ejector function or stop functioning. The control apparatus includes prohibition control means for prohibiting the state change means from making the ejector function, according to a temperature of intake air.

Abstract: The invention discloses a brake auxiliary system having a vacuum container, which comprises an auxiliary power supply, a vacuum pump, a vacuum booster and a vacuum container, wherein the vacuum container and the vacuum booster are both connected with the vacuum pump which supplied power by the auxiliary power supply, a pressure detector and a delay control switch are disposed on the vacuum container, keeping the vacuum degree in the vacuum container within a certain range. The vacuum container of the present invention makes the vacuum pump enable to work intermittently, avoiding frequent start of the vacuum pump when brake and also extending the life of the brake. Because of the pressure detector and the delay control switch, the vacuum inside the vacuum container is kept stable, and the efficiency of vacuum booster is ensured.

Abstract: The brake actuation device of a motor vehicle brake system includes a pneumatic brake booster 1, the interior of which is subdivided into at least one vacuum chamber and one working chamber, a master brake cylinder 2 and a pneumatic motor-and-pump assembly 3 for providing the vacuum in the vacuum chamber, which has a vacuum pump 6 and a motor 7 driving the vacuum pump 6. A vacuum level in the vacuum chamber or a difference in pressure between the vacuum chamber and the working chamber is sensed using a sensor 9, and the motor-and-pump assembly 3 is enabled by an electronic control unit 12 when the vacuum falls below a first defined bottom vacuum level Pe in the vacuum chamber and is disabled when a second defined top vacuum level Pa is reached. The rotational speed np of the motor-and-pump assembly 3 is controlled depending on driving conditions of the vehicle.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, comprising a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly comprises a logic module and a power module, which are arranged separately of each other.

Abstract: The present invention provides a vacuum intensifier for vehicle brake that stably provides enough negative pressure at a predetermined level or more to a brake booster even though the operational condition of engine and the surroundings change, with simple structure and good assemblage.

Abstract: A vacuum brake booster and a method of operation of a vacuum brake booster of a vehicle brake system is disclosed. The vacuum brake booster includes a housing subdivided into at least one vacuum chamber and at least one working chamber. The vacuum chamber is connected to a vacuum source by way of a vacuum port. A sensor unit is associated with the vacuum chamber and is configured for sensing a pressure in the vacuum chamber and supplying a sensed pressure value to an electronic control unit (ECU). The ECU includes an evaluating unit for evaluating the sensed pressure value and calculating the operating point of the vacuum brake booster solely on the basis of the sensed pressure in the vacuum chamber. Plausibilisation of the sensed pressure value is performed to monitor the overall system and identify defects of the sensor unit or the vacuum brake booster.

Abstract: The present invention relates to an internal combustion engine (1) of the Otto type, comprising an induction pipe (3) in conjunction with the engine's (1) cylinders, a brake servo unit (15), a flow connection (29) for evacuating air from the brake servo unit (15) to the induction pipe (3) for the purpose of building up a vacuum inside the brake servo unit (15), in conjunction with which a Venturi unit (25) is arranged in the flow connection (17, 19) to assist with the building up of the aforementioned vacuum. The internal combustion engine is characterized in that the flow connection (17, 19) comprises a bypass line (29) having a lower flow resistance than the Venturi unit (25), the bypass line (29) being intended to connect the evacuated air past the Venturi unit (25) in the event of a transient vacuum in the induction pipe (3).

Abstract: The invention relates to a travel limiting element in a brake booster device for a motor vehicle brake system, comprising a pair of longitudinal legs which are connected together via at least one transverse leg, wherein the travel limiting element can be brought into contact with a stop of the brake booster device. In favour of a simple design and cost-effective production, the travel limiting element comprises two dimensionally stable reinforcement braces which extend along the longitudinal legs, and the transverse leg is made of a damping material which surrounds the two longitudinal legs at least in sections.

Abstract: The present invention relates to a brake booster device for a vehicle brake system comprising a force input element, a control valve arrangement actuable via the force input element, a chamber arrangement disposed in a housing and comprising a vacuum chamber and a working chamber, which is separated from the vacuum chamber by a movable wall and connectable selectively to a vacuum source or the atmosphere, and a force output element, wherein the movable wall is biased into a normal position by means of a resetting spring accommodated at least partially in the housing and wherein the housing is penetrated by at least one fastening bolt. In this case, it is provided that at least one damping element acts for the purpose of vibration damping on the resetting spring, wherein the at least one damping element is mounted on the at least one fastening bolt.

Abstract: The invention relates to a brake force generating device for a hydraulic vehicle brake system with a force input member, which can be or is coupled to a brake pedal, a master cylinder arrangement for generating a hydraulic brake pressure, a chamber arrangement, in which a working chamber is separated from a vacuum chamber via a movable wall, a control valve device with a control valve housing for optional connection of the vacuum chamber to the working chamber or of the working chamber to the atmosphere and an electrically triggerable actuating device for actuating the control valve device, which is positioned as floating in the control valve housing. According to the invention it is provided that the control valve device has a first seal seat and a second seal seat, the seal seats being arranged on opposite sides of the actuating device in respect of the longitudinal axis.

Abstract: Each time a prescribed cycle comes to an end, an ECU estimates an average retaining amount of brake fluid in a reservoir of the current prescribed cycle on the assumption that a pump has sucked a constant amount of brake fluid in the current prescribed cycle. The ECU calculates deviation between the average retaining amount at the end of the previous prescribed cycle and the average retaining amount at the end of the current prescribed cycle. The greater the deviation is, the greater a deviation correction amount the ECU sets. The ECU performs deviation pump control in which the target suction amount of the pump is set based on the reference suction amount and the deviation correction amount.

Abstract: A control system for a brake vacuum pump, the system being capable of accumulating a negative pressure required for a vacuum chamber, without excessively operating the vacuum pump. In this system, an EGI_ECU determines whether a vehicle has experienced running at a speed equal to or higher than a preset creep vehicle speed after the startup of an engine. The EGI_ECU prohibits the operation of the vacuum pump until the time when the vehicle experiences running at a speed equal to or higher than the creep vehicle speed. Thereby, in a situation obviously not requiring a strong braking force, such as in a stopped state immediately after the startup of the engine, the operation of the vacuum pump can be prohibited, which allows the vacuum pump to be accurately prevented from an unnecessary drive.

Abstract: A suction system comprising a suction pump (1) having at least one suction connection (2,2?,2?) and a delivery connection (3), a receiving reservoir (4) connected to the delivery connection (3), connecting pipings from a suction connection (2,2?) to a first space (7) from which a first fluid (8) should be sucked, and connecting pipings from the delivery connection (3) to the receiving reservoir (4), characterized in that the system further comprises a connecting piping (14,15,16) extending from a second space (10), from which a second fluid (11) should be sucked, to a suction connection (2,2?) of the pump (1), and comprises a device (12) disposed for causing an intermittent operation of the second fluid suction by the pump (1), responsive to the level reached by the second fluid (11) in the second space (10).

Abstract: In order to prevent a vehicle fitted with braking assistance and trajectory correction devices and having a highly placed center of gravity from overturning in a bend when there is a sudden turn of the steering wheel at the same time as a sudden braking action, a hydraulic braking circuit comprising a hydraulic pump (3) which sucks a fluid contained in a reservoir (3) through a master cylinder (1), is provided with a bladder (10). The bladder, placed between the master cylinder and the hydraulic pump, reduces the duration of flow of the hydraulic fluid to the pump, ensuring a sufficient suction pressure at the entrance of the pump in order to cram the brake and cause the wheel having the most pressure to skid.

Abstract: The present invention provides a vacuum intensifier for vehicle brake that stably provides enough negative pressure at a predetermined level or more to a brake booster even though the operational condition of engine and the surroundings change, with simple structure and good assemblage.

Abstract: A negative pressure supply apparatus for brake booster, arranged to supply an intake-pipe negative pressure in an engine intake system to a brake booster mounted in a vehicle, comprises a negative pressure supply part communicated with a bypass passage which allows part of air flowing in the intake pipe to bypass the intake pipe and supplies the intake-pipe negative pressure to the brake booster; an air ejector part placed in the bypass passage to increase the intake-pipe negative pressure and supply the increased negative pressure to the brake booster; and an open/close device including a temperature-sensitive medium, the device being placed in the bypass passage upstream of the air ejector part and configured to open and close the bypass passage.

Abstract: The ignition timing is sustained at an initial value during a predetermined time beginning at a start of an engine, and is retarded after the predetermined time is elapsed to heat a catalyst at an early time. The predetermined time ends when the negative pressure of an intake pipe or the negative pressure of a brake booster reaches to a predetermined value. That is, the predetermined time is a period, which begins at a start of the engine and ends when a proper negative pressure can be sustained in the brake booster. As a result, it is possible to assure a negative pressure in the brake booster at an early time and to reduce exhaust emission at a start of the engine simultaneously.

Abstract: A vacuum generator is provided wherein the intake vacuum of a combustion engine is led to a negative pressure device such as a vacuum booster of a brake booster device through a check valve. An idling air passage is connected to a suction pipe of the combustion engine to bypass a throttle valve arranged in the suction pipe. An ejector is arranged in the idling air passage at the downstream of an idle speed control valve in serial relation to the same, and the intake for idling is performed through the ejector. As the intake air flow passing through the idling air passage increases, the intake negative pressure which is generated at a vacuum takeout port of the ejector is further increased in absolute value, whereby the negative pressure device has a negative pressure which is further increased in absolute value.

Abstract: Vehicle braking system including a vacuum booster for transmitting a boosted brake operating force to a master cylinder such that the boosting ratio is reduced at a fixed transition point before the boosting limit point is reached, a brake having a wheel brake cylinder connected through a fluid passage to a master cylinder serving as a first hydraulic pressure source, for braking a wheel, and a pressure increasing device having a second hydraulic pressure source connected to the fluid passage, and wherein the pressure increasing device initiating a pressure increasing operation, when the brake operating force has increased to the transition point, to increase the wheel cylinder pressure to be higher than the master cylinder pressure, by using the second hydraulic pressure source.

Abstract: A towed vehicle brake actuation system featuring an adjustable inertia switches, each in series with a relay with a solonoid coil.

Abstract: In controlling the operation of a powered brake system of a vehicle in which wheel cylinders of the brake system are supplied with brake fluid compressed by a motor powered pump under a control of an electric controller according to a stroke of depression of a brake pedal by a driver detected by a brake depression stroke sensor and a master cylinder pressure generated by the brake depression detected by a master cylinder pressure sensor, a brake control device makes a double checking if the depression stroke detected by the sensor exceeds a predetermined threshold value, and also if the brake pedal is depressed at least for a predetermined stroke detectable by a stroke limit switch, before starting the operation of the powered brake system. When the stroke limit switch has failed, instead, the brake control device checks if the master cylinder pressure increases to a predetermined value to start the operation of the powered brake system with an initial biasing reduction of the starting brake force.

Abstract: The present invention is a vacuum operated brake actuation sytem for actuating a towed vehicle's brake system. In a preferred embodiment it comprises a source of vacuum, a vacuum level sensor and switch, an electrically operated, spring return, four way, two position, vacuum valve with speed controls, and a double acting vacuum operated cylinder that actuates the towed vehicle's brake pedal which actuates the towed vehicle's brake system as the cylinder is directed by the valve. The preferred embodiment also comprises electrical wiring, vacuum hoses, fittings, connections, check valves, a breakaway switch, and other miscellaneous bracketry and hardware as required to complete the system. A vacuum pump along with a vacuum level sensor and switch for monitoring vacuum levels and passing electrical power to operate the vacuum pump as required are included in the preferred embodiment of the present invention.

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 brake system for automotive vehicles has a pneumatic brake power booster with two chambers one of the chambers being adapted to be acted upon by a low pressure and the other one by a higher pressure, and at least one of the chambers being adapted to be connected to a pneumatic pump. A device is provided to activate and deactivate the pump in response to the pressure that prevails in the chamber of the brake power booster associated with the pump.

Abstract: A towing/towed vehicle braking system translates towing vehicle braking fluid pressure into air pressure. An actuator is driven by this air pressure to depress the towed vehicle brake pedal in response to an elevated level of towing vehicle brake fluid pressure. A three-way valve controlled by the brake light wire of the towing vehicle releases the air pressure in the conduit when the towing vehicle brakes are released.

Abstract: The invented apparatus is designed for use with a tow vehicle and trailer combination. The apparatus includes a controller, and can also include a vacuum sensor and a vacuum pump. The vacuum sensor is communicatively coupled to sense the vacuum supply available to operate a trailer brake system that is interfaced to the tow vehicle's brake system to coordinate braking of the trailer and vehicle. The vacuum sensor generates a vacuum pressure level signal supplied to the controller. The controller periodically determines whether the vacuum pressure level is less than a first predetermined vacuum pressure level. If so, the controller activates the vacuum pump by generating a vacuum pump switch signal. On the other hand, if the vacuum pressure level is greater than the first predetermined level, the controller does not activate the vacuum pump switch signal.

Abstract: Energization of a fluid-pressure operated booster is controlled solely by operation of a solenoid-operated valve device, suitably first and second solenoid-operated valves, responsive to signals from an electronic controller. The construction of the booster is therefore modified in comparison with known boosters by the omission of the conventional mechanical valve adapted to be operated by the pedal for normal operation of the booster.

Abstract: This invention improves the capability of bleeding a chamber, disposed in the course of a line, that receives pressure fluid. On the pressure side of a high-pressure pump that pumps pressure fluid through a line, a chamber of circular-cylindrical cross section is disposed in its course. Two line segments of the line discharge into the upper face end of the chamber. A guide body disposed coaxially with the longitudinal axis of the chamber is received in the chamber in the region of this face end. The guide body embodied substantially in the form of a circular disk, defines an annular gap toward the inside circumference of the chamber and a subchamber of the chamber toward the face end of the chamber. The guide body directs air located in the chamber into the subchamber, from which it is carried away by the flow of pressure fluid. The hydraulic brake system is especially suitable for motor vehicles.

Abstract: A spring and lever arrangement for imparting a spring force to a plunger of a control valve in a brake booster by operating a solenoid member during a brake application. Movement of the plunger by an operator input force allows a pressure differential to develop across a moveable wall and produce an original output force which is supplied to a pressurizing member. Resistance to movement of the pressurizing member creates a reaction force. The reaction force balances the spring force and operator input force to terminate the development of the pressure differential while correspondingly modifying the output force supplied to the pressurizing member. A switch allows an operator terminate the operation of the solenoid to effectively obviate the spring force and allow the original output force to be produced by the operator input force.

Abstract: A brake system is provided which includes a restoring unit by which a restoring force can be applied to the pedal. Since the pedal, at the same time, actuates a control valve 9 determining the booster force, during a restoring operation, the booster force also is reduced. The wall 40 accepting the restoring forces advantageously can be located in the booster housing 5 between the master cylinder 1 and the booster wall 6. Since the wall 40 covers relatively small distances only relative to the booster wall 6, the overall length of the booster housing 5 is not significantly increased.

Abstract: A vacuum supply system for a brake power assist unit of a motor vehicle with at least one additional vacuum consuming device is achieved by the installation of a valve, which can be switched as a function of existing vacuum level in a pipe leading from the vacuum generating device to the at least one additional consuming device. Switching of the valve causes a throttling of this pipe to be more extensive when the existing vacuum level is above a certain absolute pressure value.

Abstract: A vacuum supply system for a brake power assist unit of a motor vehicle and at least one additional vacuum consuming device, is achieved by a parallel arrangement of two pipes leading from a vacuum generating device one to the brake power assist unit and one to the additional consuming device. Both pipes are equipped with flow control devices one of which is blockable by means of a check valve with an increased restoring or closing force for securing a vacuum supply priority for the brake power assist unit.

Abstract: A method and an apparatus for charging a brake system with brake liquid, when the brake system includes an anti-lock brake device, utilizes vibration generated by a motor of the anti-lock brake device to eliminate small amounts of liquid which may remain trapped during the discharge of air from the passages of the brake system and which can prevent complete removal of air from the system. After the air discharge has finished, brake liquid is supplied into the brake system.