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 method for controlling a hydraulically actuated rotor brake for a drive train of a wind energy plant, wherein the rotor brake is realized as an active rotor brake, which exerts a braking moment getting stronger when the hydraulic pressure increases, wherein in a first phase, a brake cylinder is pressurized with a first pressure via a first pressure reducing valve, in a second phase, the brake cylinder is pressurized with a second pressure via a second pressure reducing valve, and a switchover equipment is provided, which switches over from the first pressure to the second pressure.

Abstract: A wind energy plant with a hydraulically actuated rotor brake for a drive train, which has at least one hydraulically actuated brake cylinder, the braking moment of which gets stronger when the hydraulic pressure increases, wherein a volume of hydraulic fluid is tensioned by a pressure reducing valve in the brake cylinder and in the pressure line thereof when the brake is actuated, wherein an accumulator with hydraulic fluid is provided, which is connected to the pressure line.

Abstract: A control for use in a hydraulic circuit where the control can act as a valve and an auxiliary pressure source for the hydraulic circuit.

Abstract: A parking brake interlock is provided according to the invention. The parking brake interlock includes a parking brake inlet configured to receive a parking brake air supply, a service brake inlet configured to receive a service brake air supply, an exhaust port, and an interlock valve mechanism in communication with the parking brake inlet, the service brake inlet, and the exhaust port. The interlock valve mechanism is configured to exhaust the parking brake air supply if the service brake air pressure is not received. The interlock valve mechanism is further configured to hold the parking brake air supply in order to generate a parking brake air pressure if the service brake air pressure is received.

Abstract: A regenerative braking coordination device has a braking operating member receiving an input from a driver in the form of an operation amount, an input shaft operable for transmitting the operation amount, and a braking force boosting device operable to generate a hydraulic braking pressure corresponding to the operation amount transmitted by the input shaft. The device further includes a hydraulic pressure braking device to generate a braking force and an operation amount absorber for absorbing the operation amount of the input shaft. The operation amount absorber includes a cylinder, a piston dividing the interior of the cylinder into first and second hydraulic chambers and an orifice connecting the first and second hydraulic chambers. The orifice can be in the piston or in a flow channel.

Abstract: The hydraulic brake system comprises a piston/cylinder unit (14) for activating and releasing a brake (12), comprising a volume (16) adapted to have a pressurized working fluid supplied thereto for moving the piston (24) from a braking position into a release position for releasing the brake. Further, the hydraulic brake system comprises a supply line (18) for the supply of working fluid from a reservoir (22), a discharge line (30) for the discharge of working fluid from the volume (16) of the piston/ cyliinder unit (14), a first valve (34) and an element (36) for determining the flow resistance, a bypass line (32) provided with a second ON/OFF valve (38) and arranged for a flow in parallel to the discharge line (30).

Abstract: A system for a firefighting vehicle including a single compressor, driven by the engine of the firefighting vehicle, which generates a compressed fluid supply for operation of both the compressed air foam system and air brakes of the firefighting vehicle. The system can include a fluid storage tank that receives compressed fluid generated by the compressor. The storage tank can be in fluid communication with a dryer and a foaming system. The dryer dries a portion of the compressed fluid and supplies the dry fluid to one or more brake system tanks, which further provide a fluid supply to one or more air brakes of the vehicle to provide a braking force to stop the vehicle. An optionally undried portion of the fluid in the fluid storage tank can be in communication with a conduit which is further in communication with a foam supply and a liquid supply which mix with the compressed fluid to create a compressed fluid foam firefighting material.

Abstract: An apparatus engageable with a hand brake assembly for automatically applying at least one brake secured to a railway vehicle. The apparatus comprises an operating mechanism which is a two stage pneumatic cylinder having a primary portion for initial phase of the brake application and a secondary portion for the final brake application to apply high forces and to comply with AAR requirements. A source of fluid pressure is connected to the operating mechanism for periodically supplying a predetermined pressure thereto. A first control device is connected to the source of the fluid pressure for initiating the supply of such predetermined pressure to the operating mechanism. A second control device is connected to the source of the fluid pressure for regulating the supply of such predetermined pressure to the operating mechanism thereby causing an automatic application of such brake by the hand brake assembly.

Abstract: A parking brake for a motor vehicle includes: a manual operating lever; a braking device designed to act on brake disks applied on a bevel pinion for transmission of the motion to the wheels of the motor vehicle; and a cable for transmission of the command imposed via the lever on the braking device. The brake is activated either automatically by a hydraulic actuator when the engine of the motor vehicle is turned off, or alternatively, by a manual command imposed by the operator through the lever whether or not the engine of the motor vehicle is running.

Abstract: The invention relates to a brake system configured to enhance control and maneuverability of a three-wheeled agricultural applicator. The brake system includes a brake pedal in fluid communication with a rear brake system and a front brake system. The front brake system includes a flow limiter in communication with a brake actuator configured to delay application of a second braking force by the front brake system relative to application of a first braking force by the rear brake system. The front brake system includes a front brake mechanism comprising a caliper assembly in combination with a disc brake configured to apply the second braking force to the at least one front wheel assembly. The caliper assembly employs a spacer combined with a series of bushings to float the caliper assembly in general alignment with movement of the disc brake caused by dynamic forces associated with operation of the vehicle.

Abstract: A method and apparatus for a power dissipation management system for a vehicle where a thermal condition of a plurality of driveline components is determined. The quantity of energy for each driveline component can absorb is determined based upon its thermal condition. A braking signal to one or more of the driveline components is provided based upon the quantity of energy each component can absorb.

Abstract: An electrically or manually operable brake drive for the brakes of a vehicle which has a gear train optionally driven by a reversible electric motor or a manual member. The brakes can be set or released by the electric motor without manual changing of the drive components permitting setting and releasing of the brakes at a location remote from the drive. For maintaining the brakes in a “set” mode, the drive includes a gradual release detent mechanism which permits rotation of the gears in the brake setting direction but opposes such rotation in the opposite direction unless a drive shaft rotatable by the motor or the manual member is rotated in the brake release direction.

Abstract: An electrically or manually operable brake drive for the brakes of a vehicle which has a gear train optionally driven by a reversible electric motor or a manual member. The brakes can be set or released by the electric motor without manual changing of the drive components permitting setting and releasing of the brakes at a location remote from the drive. For maintaining the brakes in a “set” mode, the drive includes a gradual release detent mechanism which permits rotation of the gears in the brake setting direction but opposes such rotation in the opposite direction unless a drive shaft rotatable by the motor or the manual member is rotated in the brake release direction.

Abstract: During operation of a vehicle, an operator actuates a primary brake system to slow or stop the vehicle. The present invention detects when the primary brake system is not retarding vehicle motion as desired and responsively applies a secondary brake system. The secondary brake system is provided as a backup to the primary brake system.

Abstract: A vehicle has a brake operator device adapted to travel in a range of brake operator device positions and produce a brake input signal, and a transmission adapted to produce a transmission gear signal. An electronic control module receives the brake input signal and the transmission gear signal and responsively controls engine braking, brake engagement, and/or a transmission downshift. The engine, brakes, and transmission are controlled differently responsive to the brake operator device position depending upon the transmission being in a higher or lower gear. In addition, braking is controlled during a downshift to avoid jerk.

Abstract: The parking brakes on a truck or other vehicle having plural axles are applied such that at least one wheel at a first end of a first axle receives a parking brake force without applying a parking brake force to any wheel at the opposite end of the first axle. In addition, at least one wheel at a second end of a second axle, the second end of the second axle being opposite to the first end of the first axle, receives a parking brake force. Desirably, any wheels at the opposite end of the second axle from the second end of the second axle are not the recipient of a parking brake force such that diagonally disposed parking brake forces are applied upon activation of the vehicle parking brakes. The first axle in one example is forwardly of the second axle and the first end of the first axle may be at the longitudinal side of the vehicle which is the heaviest.

Abstract: The present invention provides a brake heat reducing system for reducing the temperature of brake components in vehicles, the brake heat reducing system cooperating with the braking system of the vehicle and having a control device having an accelerometer that is energized in response to vehicular braking and a timer relay. A modulating device has a solenoid valve connected to the timer relay and is activated by the control device in response to vehicular braking for modulating braking pressure during occurrence of vehicular braking.

Abstract: In a hydraulic brake pressure control device of a load responsive type, a housing is attached to one of a rear wheel side member and a vehicle body side member which are connected with each other through a suspension mechanism and a lever is carried on the housing through a pivot axis to be pivotable toward the housing for direct or indirect abutting engagement with a piston formed with a valve portion. A spring member is interposed between a free end portion of the lever and the other of the rear wheel side member and the vehicle body side member for urging the lever toward the piston by means of a spring force depending on the distance between the rear wheel side member and the vehicle body side member. Further, an anti-vibration member is provided between the lever and the housing for moderating the collision of the lever with the piston when the lever is repetitively disengaged from, and engaged with, the piston during the vehicle running a bumpy road.

Abstract: A method of controlling a pump-driven type vehicle hydraulic brake system which can suppress pulsation of brake hydraulic pressure and makes it possible to accurately and quickly apply brake hydraulic pressure is provided. Using an equation between the pressure rising speed of the hydraulic pressure in the master cylinder and the approximate required driving force of the motor, the driving force of the motor is set from the pressure rising speed of the detected hydraulic pressure. The driving force of the motor is controlled to minimize the hydraulic pressure difference between the brake hydraulic pressure increased by the preset driving force and the hydraulic pressure in the master cylinder, thereby bringing the brake hydraulic pressure substantially close to the hydraulic pressure in the master cylinder.

Abstract: An hydraulic brake system that rapidly and precisely slows or reduces speed by constraining or stopping the movement of a link mechanism connected between a piston and a rotational driving shaft of a power system with physical force generated due to the incompressible fluid characteristic by constraining or stopping the flow of oil filled in an hydraulic oil chamber. The hydraulic brake system includes a lubricating section for supplying the oil reserved in a protective casing to friction sliding parts of respective components through pumping movement by utilizing the reciprocal movement of a piston rod, and an oil supplement section for supplementing the hydraulic oil chamber with the oil. The hydraulic brake system has improved durability and anti-abrasion, and provides emergency braking in the event of oil leakage.

Abstract: A supplemental brake system for a vehicle having its own primary braking system by which the vehicle may be slowed from a towing vehicle. The supplemental brake system includes a vacuum-operated servo unit that is connected to the brake pedal of the vehicle and has a pneumatic connection by which it can be connected to the towing vehicle.

Abstract: A brake control apparatus comprises a brake disk, a main brake mechanism, a subsidiary brake mechanism, a wheel speed sensor, and a control device. The brake disk rotates with a wheel. The main brake mechanism and the subsidiary brake mechanism press a main pad and a subsidiary pad to the brake disk on the basis of an operation of a brake pedal, respectively, to apply a brake to a wheel. The control device detects whether or not the wheel becomes an instant condition preceding a locking or an initial condition of the locking, in accordance with a detected result of the wheel speed sensor. When the wheel becomes the instant condition preceding the locking or the initial condition of the locking, the control device controls the main brake mechanism to make the main brake mechanism temporarily reduce the press force of the subsidiary pad.

Abstract: An hydraulic brake system that rapidly and precisely slows or reduces speed by constraining or stopping the movement of a link mechanism connected between a piston and a rotational driving shaft of a power system with physical force generated due to the incompressible fluid characteristic by constraining or stopping the flow of oil filled in an hydraulic oil chamber. The hydraulic brake system includes a lubricating section for supplying the oil reserved in a protective casing to friction sliding parts of respective components through pumping movement by utilizing the reciprocal movement of a piston rod, and an oil supplement section for supplementing the hydraulic oil chamber with the oil. Accordingly, the possible abrasion of the respective friction sliding parts is constrained, and the durability is improved. Further, in the event of oil leakage, the oil is supplemented for emergency-braking, so that a possible accident can be prevented.

Abstract: An hydraulic brake system that rapidly and precisely slows or reduces speed by constraining or stopping the movement of a link mechanism connected between a piston and a rotational driving shaft of a power system with physical force generated due to the incompressible fluid characteristic by constraining or stopping the flow of oil filled in an hydraulic oil chamber. The hydraulic brake system includes a lubricating section for supplying the oil reserved in a protective casing to friction sliding parts of respective components through pumping movement by utilizing the reciprocal movement of a piston rod, and an oil supplement section for supplementing the hydraulic oil chamber with the oil. Accordingly, the possible abrasion of the respective friction sliding parts is constrained, and the durability is improved. Further, in the event of an oil leakage, the oil is supplemented for emergency-braking, so that a possible accident can be prevented.

Abstract: The precharging device is part of a hydraulic brake system of a vehicle and serves to impose brake fluid under pressure selectively on a brake assembly, by means of a charging unit. To activate the imposition of brake fluid, the charging unit is operatively connected to a fuel supply system. The charging unit is preferably embodied as a piston unit.

Abstract: The present specification describes an actuating lever (21) for a disc brake (1, 7), having a cam section (23) with a part cylindrical curved surface (25) and a part cylindrical channel (27) with an elongate cylindrical force transmitting member (29) located therein and being parallel to the longitudinal axis of the said part cylindrical surface (25), and having opposite end regions which are located in recesses (31, 33) formed in the lever (21) at opposite ends of the said channel (27) to thus retain the force transmitting member (29) in position on the lever (21).

Abstract: A method for the controlled power activation of an electromechanical braking system in a motor vehicle where the maximum power available is less than the nominal capacity includes the step of activating brake force-generating units of the braking system individually or in subgroups in succession to one another. The brake force-generating units are in each case activated with a power level corresponding to a portion of the maximum power available. The portion of the maximum power available is sufficient for the individual unit to function at least partially.

Abstract: A hydraulic brake system wherein a portion of a volume of a first fluid supplied to a steering system by a pump is selectively diverted to an actuator assembly for a master cylinder to develop an force for actuating a master cylinder to pressurize fluid which is supplied to wheel brakes. An electronic control unit (ECU) for the brake system receives a first input signal indicative of the flow of fluid from the pump in the steering system, a second input signal indicative of the input force applied by the operator and a third input signal indicative of the speed of the wheels of the vehicle for developing a pulse modulated operational signal. The electronic control develops an operational signal which is supplied as the pulse modulated operational signal to a magnetic responsive valve. The pulse modulated operational signal creates a variable orifice in the magnetic responsive valve to restrict the flow of the first fluid to the steering gear and increases the fluid pressure of the first fluid.

Abstract: A hydraulic braking system, method for controlling the hydraulic braking system, and a control system for controlling the hydraulic braking system are provided. The hydraulic braking system may be applied to any kind of moving elements or systems. For example, this system can be used with wind turbines, conveyor systems, etc.

Abstract: An automotive suspension-locking device mounted to a shock absorber having a cylinder and a piston rod, the suspension-locking device includes a brake band provided around the piston rod of the shock absorber for locking and unlocking the shock absorber, structure for controlling the brake band, the control structure being connected to both end portions of the brake band, and an actuator connected to the control structure by a piston rod thereof for actuating the control structure.

Abstract: A system generates a brake pressure with a pump which delivers a volume into the chamber of a master brake cylinder and builds up a pressure which is used by at least one additional assembly, particularly a power-assisted steering system. The system has at least one distributing and throttling element for admitting a definable pressure to the chamber of the master brake cylinder and/or the additional assembly. The one or more distributing and throttling elements can be triggered, as a function of the brake pedal position and/or of driving condition values and/or of operating values of the vehicle, such that the chamber and/or the additional unit can be acted upon by a pump generated adjustable pressure.

Abstract: A braking system controlled by an operator's pedal for a vehicle equipped with a mechanically actuated brake clutch pack in which a cam is rotated in response to movement of a brake pedal to operate a pressure-modulating hydraulic valve to direct fluid pressure to an hydraulic actuator extendable under pressure to engage a force transfer member secured to an actuator rod, which rod is connected to apply the clutch pack when tensioned.

Abstract: A brake apply system includes a pressure charging module having a bore carrying a pumping piston that has a base piston surface and an augmentation piston surface. The pressure charging piston separates the bore into an input chamber adjacent the base piston surface and an output chamber adjacent the augmentation piston surface. A suspension damper is hydraulically connected to the input chamber of the pressure charging module, preferably through a continuously open fluid communication circuit. A wheel brake is hydraulically connected to the accumulator output chamber through a selectively open fluid communication circuit.

Abstract: A boom hoist system for supporting and adjusting the position of a lifting crane gantry is provided including a drum, a drive system, and first and second braking systems for selectively stopping rotation of the drum. The boom hoist system operates independently from crane mechanical works and the first and second braking systems may include sensors for automatically engaging when specified conditions occur in order to prevent a hoisted gantry from falling uncontrollably in the event of a hoist system malfunction or failure.

Abstract: An emergency stop apparatus for a hydraulic speed change gear is capable of quickly reducing the pump discharge to zero in order to stop the traveling of a vehicle at the time of an emergency, where the vehicle employs a hydraulic travel drive system, such as in construction equipment, agricultural equipment, etc. The apparatus includes a variable capacity type hydraulic pump (41); a hydraulic motor (43); a travel operating level (59); an intermediate lever, which is connected to the travel operating lever by a wire cable; a servo valve (52); a servo valve input lever (57), which is attached to the servo valve; and an interlock device between the intermediate lever and the servo valve input lever.

Abstract: Two methods of calibrating Fax machines are disclosed. The first method utilizes a pre-printed calibration chart and a computer connected to the Fax machine to be calibrated. The calibration chart is fed into the Fax machine which sends the resultant data to the computer. This data is analyzed by the computer to determine when the Fax machine started to scan the calibration chart. If the scan process did not occur at an optimum point, the computer sends a correction value back to the Fax machine to cause the Fax machine to begin scanning subsequent documents at an optimum point. In the second method, a calibration chart is printed by the Fax machine and then fed back into the machine. A copy of the scanned calibration chart is made to determine at what point the Fax machine began scanning the chart. If the Fax machine did not begin scanning at an optimum point, a user reads the copy and manually enters a corrective offset in to the Fax machine such that subsequent documents are scanned properly.

Abstract: There is provided a hydraulic braking apparatus, characterized in that it comprises: a first safety valve for draining a high pressure fluid at the side of a second port of a hydraulic motor into the side of a first port thereof; a second safety valve for draining a high pressure fluid at the side of the said first port of the said hydraulic motor into the side of the said second port thereof; and a braking valve adapted to be switched from a neutral position to a first position or a second position under a difference in pressure between the said first port and the said second port, the inlet side of each of the said first safety valve and the said second safety valve having a communication via the said braking valve with the side of each of the said first port and the said second port, and having an increased area of such communication when the said braking valve is set in the said neutral position and a reduced area of such communication when the braking valve is switched to the said first position or to th

Abstract: An orifice and a one-way valve for permitting a flow of a liquid only in one direction from a primary master cylinder to an input port in a secondary master cylinder of a brake system are incorporated in parallel in an hydraulic pressure introduction passageway which connects the input port in the secondary master cylinder and an output port in the primary master cylinder. Thus, it is possible to moderate a kick-back phenomenon due to a back-flow of a pressure oil from a hydraulic pressure chamber in the secondary master cylinder via the input port toward the primary master cylinder, and to rapidly fill a brake oil in the secondary master cylinder from the side of the primary master cylinder.

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: An electronic braking system for a multi-axle road vehicle, having a foot-operable braking transducer which generates electrical braking demand signals representative of a driver's braking demand, load transducers which generate electrical load signals representative of the respective load on different axles of the vehicle, and in electronic controller which receives the braking demand signals and load signals and generates electrical output signals for controlling the operation of braking devices for the wheels carried by axles, the controller including adaptive load compensation device which acts to modify the output signals of the controller to the various braking devices so as to take account of prevailing loads on the respective axles.

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: An emergency brake system for wheeled vehicles includes a deformable brake wedge for each tire on one of the vehicle's axles. The brake wedges are constructed and arranged to transfer substantially all braking forces to the vehicle through the vehicle's tires during emergency braking. The system also includes releasable device for allowing the brake wedges to move between inoperative and operative positions and electrically-controlled device for retaining the brake wedges in those positions. While the brake wedges move from the inoperative position to the operative position, a control system temporarily applies the vehicle brakes associated with the tires that engage the brake wedges during emergency braking.

Abstract: A pneumatic brake system for use with an additional brake including a by-pass valve in parallel to a shut-off valve. The by-pass valve is opened only during an actuating or controlling of the pneumatic brake which exceeds a control range and opens up the passage through the brake pressure line irrespective of the switching condition of the shut-off valve. The connection of the brake cylinder line section of the brake pressure line with the atmosphere by the shut-off valve is at least choked when the by-pass valve is opened up.

Abstract: A plurality of spaced louvers in an airflow control system on top of a tractor cab open up to permit a flow of air to impinge on the front face of the trailer to exert a braking force to augment the braking force exerted by the wheel brakes to slow down the tractor-trailer assembly. The louvers are under the control of the operator to be responsive to manual control, or to selective automatic control from the brake pedal, accelerator pedal, engine operation, or other vehicle operational equipment.

Abstract: The invention relates to an electro-hydraulic braking system for the wheels of aircraft landing gear. The system comprises two hydraulic pressure sources each feeding a hydraulic circuit that leads to the brakes of two groups of wheels via a single braking control stage. A circuit connects either a solenoid valve electrically controlled by the control unit or else a double metering valve mechanically controlled by the brake pedals via two shuttle valves, to one inlet of each control stage. A second circuit directly connects a solenoid valve to a second inlet of each of said control stages. Each control stage includes two symmetrical internal circuits having one servo-valve per corresponding brake, which servo-valves are cross-connected by means of a respective corresponding controlled valve. In the event of one of the circuits breaking down, the servo-valves associated with the other circuit then serve, after automatic reconfiguration, also to provide braking and anti-skid control in a paired tandem mode.

Abstract: A unique addition of hydraulic cylinders, valves, switches and a pump to assist the existing air brake system now used on todays tractor-trailer trucks without altering the basic function of the air brake system and provides independent, boosted intermittent braking without expelling the air.

Abstract: A wheel brake includes at least two brake disks; a brake fluid feed for feeding brake fluid under pressure; and a pressure system connected to the brake fluid feed and acting on the disk brakes. At least one of the brake disks is made of metal, while at least one other of the disks is made of carbon. The pressure system includes actuators respectively associated with the metal disk and with the carbon disk and fed with brake fluid via respective parallel connections; and also a pressure interruption system responsive to the action of the pressure of the brake fluid to take the actuator associated with the metal disk out of communication with the brake fluid feed when the fluid pressure exceeds a predetermined value.

Abstract: In a braking system for a motorcycle, a brake includes a plurality of applicators which are respectively operated by hydraulic braking pressures fed from first and second actuators, and a common antilock modulator is provided for controlling and reducing the hydraulic braking pressures from the first and second actuators. This makes the braking system having antilock control function simplified in structure.

Abstract: A controller for rear brakes of a vehicle adapted to control a braking member in accordance with an operation of a servo circuit through which pressurized air or pressurized liquid flows, includes: a fluid retarder provided to a rotary shaft which is rotated together with the rear wheels of the vehicle; an air source for applying pressure to a working liquid in the retarder to control the braking torque thereof; a liquid pressure generator communicated with the air source for converting a pressure of the air into that of the liquid; and proportioning valve member provided between the liquid pressure generator and the brakes for imparting a predetermined restriction to the pressurized liquid that flows between the liquid pressure generator and the brakes.