Abstract: A driving assist apparatus for a manual transmission vehicle includes a traveling environment information acquisition unit, a power transmission detector and a controller. The traveling environment information acquisition unit is configured to acquire traveling environment information ahead of the vehicle. The power transmission detector is configured to detect engagement or disengagement of power transmission between a drive source and a drive wheel. The controller is configured to, when recognizing a target object ahead of the vehicle based on the traveling environment information acquired by the traveling environment information acquisition unit, control a vehicle speed of the vehicle in accordance with a distance between the vehicle and the target object.

Abstract: A remote start-up method of a manual transmission vehicle is provided. The method includes a parking braking force-associated remote start-up control that remotely starts-up an inclined parking vehicle parked on a ramp by confirming a situation where the parking braking force is maintained by a braking hydraulic pressure control of an electronic stability control (ESC) system in a remote start-up controller.

Abstract: A system for controlling a compressor may include an engine controller controlling a fuel injection amount corresponding to an engine load and an opening amount of a throttle by reflecting a required torque required for an air conditioner, an operation information detector for detecting operation information according to driving state of the vehicle, a compressor generating pressure through a piston operation of a cylinder utilizing the power of the engine during operation of the air conditioner, and a controller determining an engine negative pressure of an intake manifold stored in the brake booster at a value, and when the negative pressure of intake manifold is below a first threshold value when the brake is operated, the engine enters a negative pressure recovery mode for predicting an insignificant negative pressure drop condition that falls below a second threshold value which is the A/C cut control condition and reduces the A/C duty.

Abstract: Provided is an electric brake device capable of adjusting a clearance without making a driver feel discomfort, in a vehicle equipped with the electric brake device. A control device (2) of this electric brake device (DB) includes: a brake operation amount detector (24) to detect an operation amount to a brake operation member (27) of the vehicle; and an operation record flag storage unit (19) to store an operation record flag indicating a record of a latest operation performed by the driver to the brake operation member (27), on the basis of the operation amount detected by the brake operation amount detector (24). The control device (2) further includes a target clearance determination unit (17) to determine a target clearance with reference to the operation record flag stored in the operation record flag storage unit (19).

Abstract: A brake system for a motor vehicle includes a master cylinder, an actuatable switchover valve, and at least one parking brake device. The master cylinder includes at least one brake circuit which has at least one hydraulically actuatable wheel brake. The actuatable switchover valve is configured to separate and connect the brake circuit from/to the master cylinder. The parking brake device is paired with the wheel brake and configured as a hydraulically actuatable parking brake device. For this purpose, the parking brake device has a hydraulic pressure store which is configured to be operatively connected to the brake circuit. The switchover valve is configured to be closed in at least one first de-energized state in order to separate the brake circuit from the master cylinder.

Abstract: An actuator apparatus includes an oil passage body including an oil passage therein, an electric actuator, a movable unit moved at least in a first direction and a second direction by the electric actuator, and an auxiliary device including an actuating member moved by hydraulic pressure of oil in the oil passage. When the electric actuator moves the movable unit in the second direction, the auxiliary device applies, through the actuating member to the movable unit, a force pointing in a direction that moves the movable unit in the second direction.

Abstract: A control device and method for executing a holding function using a hydraulic braking system of a vehicle including building up an initial holding pressure in at least one wheel brake cylinder using at least one brake pressure buildup device and closing at least one shutoff valve situated between the at least one wheel brake cylinder and the at least one brake pressure buildup device, a new holding pressure being built up in the wheel brake cylinder, in that an intermediate pressure less than the new holding pressure is built up between the shutoff valve and the brake pressure buildup device using the brake pressure buildup device, the shutoff valve is opened upon the presence of the intermediate pressure between the shutoff valve and the brake pressure buildup device, and brake fluid is transferred using the brake pressure buildup device through the open shutoff valve into the wheel brake cylinder.

Abstract: In a high-pressure pump, a relief valve seat surrounds an opening of a relief valve passage of a valve seat main body in a first space. A relief valve member includes a relief valve main body and a relief valve seat portion. The relief valve main body has a rod shape. The relief valve seat portion is integrated with an end of the relief valve main body so as to be capable of contacting the relief valve seat. The relief valve member is provided in the first space so as to be reciprocable in an axial direction. A relief valve urging member urges the relief valve member toward the relief valve seat. A support portion includes a support main body that slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve member in the axial direction.

Abstract: A linear drive apparatus is provided. The linear drive apparatus may include an outer tube, a sealing end cap provided at the end of the outer tube, a screw provided in the outer tube, a drive nut provided on the screw in a threaded fit, an extension rod provided between the outer tube and the screw, a sealing assembly provided between the extension rod and the sealing end cap, and a waterproof and oil-proof ventilation stopper provided on the outer tube. One end of the screw may be connected to a drive mechanism. One end of the extension rod may be connected to the drive nut. The other end of the extension rod may pass through the sealing end cap.

Abstract: The brake control device comprises a control mode selecting portion 64 which selects one control mode based on a detection result of the detecting portion from a control mode group including at least two control modes which are a responsiveness priority mode which gives more priority to a responsiveness of the braking force relative to an operation of a brake operating member than to a suppression of an operating noise occurred upon the generation of the preparatory hydraulic pressure and a serenity priority mode which gives more priority to the suppression of the operating noise than to the responsiveness of the braking force. The hydraulic pressure control portion controls the hydraulic pressure generating device to generate the preparatory hydraulic pressure in response to the control mode selected by the control mode selecting portion.

Abstract: A vehicle brake hydraulic pressure control apparatus installed in a vehicle changing a drive torque transferred to a wheel during a halt, includes vehicle holding section for performing vehicle holding control that holds an actual brake hydraulic pressure applied to the wheel during a halt and storage section for storing a holdable hydraulic pressure capable of holding the halt state of the vehicle before and after the drive torque changes during a halt, in which when determining that the actual brake hydraulic pressure is less than the holdable hydraulic pressure (first hydraulic pressure P1) at a start (time t1) of the vehicle holding control, the vehicle holding section increases the actual brake hydraulic pressure to the holdable hydraulic pressure and holds the holdable hydraulic pressure.

Abstract: A vehicle-hold control method is used to hold an engine-powered vehicle from rolling backward on a road gradient during an engine start. The engine shuts down when the vehicle is stopped following operation of the vehicle under engine power. The engine is re-started during an engine cranking interval as vehicle wheel brakes are applied. The brakes are released in response to detection of pre-calibrated engine speed characteristics.

Abstract: A stop control system for a vehicle, which is capable of positively preventing movement of a vehicle by positively increasing a braking force of the vehicle during an idle stop. In the stop control system for a vehicle of the present invention, the engine 3 is cranked by a starter motor 6 using power supplied from the battery 7 when restart conditions are satisfied during an idle stop (step 8 in FIG. 5). Further, the stop control system includes a hydraulic pump 55 driven by power supplied from the battery 7, for increasing the braking force of the vehicle V. During a stop of the vehicle V, when it is determined that the braking force of the vehicle V needs to be increased (F_BFREQ=1), the hydraulic pump 55 is activated. Further, if the restart conditions are satisfied during operation of the hydraulic pump 55, the cranking is inhibited to continue the operation of the hydraulic pump 55 (steps 6 to 9 in FIG. 5).

Abstract: A brake control device for a vehicle which can prevent occurrence of hunting or stepping during braking control operation and includes a pressure increasing or decreasing characteristic selecting portion which selects a pressure increasing characteristic when a target wheel cylinder pressure increases continuously for a predetermined operation judgment period and selects a pressure decreasing characteristic when the target wheel cylinder pressure decreases continuously for a predetermined operation judgment period. The brake control device further includes an output servo pressure setting portion which sets a target servo pressure based on the pressure increasing or decreasing characteristic selected by the pressure increasing or decreasing characteristic selecting portion and a servo pressure generating device which generates a servo pressure based on the target servo pressure.

Abstract: Systems and methods of overriding a conventional trailer emergency brake system to preclude and alert others as to inadvertent or premature movement of the trailer are described herein. One implementation includes a safety valve operatively positioned in the emergency braking system of a trailer that may be engaged to override the brake valve located in a tractor to prevent a truck driver from prematurely or inadvertently moving the trailer. In addition, the system may include a one way check valve to allow air upstream of the safety valve to bleed out of the brake system when the safety valve is closed (to prevent movement of the trailer) before the emergency brakes for the trailer are set by the driver. A communication system may also be provided to alert the driver via a remotely located computing device that the emergency brakes for the trailer need to be set.

Abstract: A hydraulic control device for work machine includes: a driving device that generates a driving force for traveling of the work machine; a park braking device that parks the work machine; an operating unit that is provided in a cab of the work machine and operated by an operator for driving a work device; a hydraulic brake device that generates a braking force according to operation of a brake pedal; a hydraulic lock unit that hydraulically locks the hydraulic brake device to cause the hydraulic brake device to be continuously operated; a work device drivable state judging unit that judges whether or not the work device is in a work device drivable state in which the work device can be driven; and a park brake control unit that brings the park braking device into operation when the hydraulic lock unit hydraulically locks the hydraulic brake device and the work device drivable state judging unit judges that the work device drivable state has not been established.

Abstract: In a method for setting the clamping force exerted by a parking brake, which is generated at least partially by an electromechanical braking device and, if needed, in supplementary fashion by a hydraulic braking device, in the provision of the hydraulic clamping force, a boost pressure to be generated in the hydraulic braking device is increased with respect to a switch-off pressure at the switch-off time that corresponds to the hydraulic clamping force.

Abstract: A method for operating a parking brake of a vehicle, in particular of a motor vehicle, which parking brake operates in the superposition mode, the brake force of the parking brake being applicable by two different force-generating actuators mutually supporting one another in the superposition mode. It is provided that the force-generating, in particular pressure-generating, actuator is activated for support even before the superposition.

Abstract: A service brake device of a vehicle, including at least one ABS pressure control valve which is controlled for slip-regulated braking by an electronic control unit, has at least one inlet valve and one outlet valve and is arranged upstream of a pressure medium actuated brake cylinder, a pressure medium line which supplies the ABS pressure control valve with pressure medium and into which a pressure controlled by a valve device arranged upstream of the ABS pressure control valve is feedable, wherein the valve device feeds a pressure derived from a reservoir pressure of a pressure medium reservoir into the pressure medium line as a function of an activation by the electronic control unit.

Abstract: An air brake locking device for a vehicle includes a main body having a pair of internal channels capable of connecting to a vehicle air line, a valve interposed between the internal channels for controlling the flow of air, and a control unit for regulating the operation of the valve.

Abstract: In a hydraulic control arrangement for an automatic transmission of a motor vehicle having a parking lock activation system wherein operating fluid is supplied via a parking lock slide valve to a first parking lock pressure chamber for moving a parking lock-up piston in one direction into a locking position or moving the parking lock piston in an opposite direction, whereby operating fluid is released from the first parking lock pressure chamber via a discharge slide valve by way of which the first parking brake pressure chamber is connected to a tank for releasing the parking lock-up.

Abstract: The present invention includes a hydraulic brake device 4, 5 that generates a braking force corresponding to an operation of a brake pedal 1 performed while the vehicle is traveling, a brake lock means 6 for applying a hydraulic lock on the hydraulic brake device 4, 5 and releasing the hydraulic lock, a brake pedal operation detection means 22 for detecting an operation of the brake pedal 1, and a control means 10 for controlling the brake lock means 6 so as to apply the hydraulic lock on the hydraulic brake device 4, 5 upon detecting via the brake pedal operation detection means 22 a predetermined depressing operation of the brake pedal 1.

Abstract: An hydraulically activated internal locking apparatus is disclosed including an hydraulic fluid reservoir, an hydraulically activated locking system and a electronic control system, where the electronic control system is in electrical communication with the locking system and the reservoir is in fluid communication with the locking system so that the locking system can be transitioned from a locked state to an unlocked state when the electronic control system receives a unlock or lock code or instruction.

Abstract: The present invention includes a hydraulic brake device 4, 5 that generates a braking force corresponding to an operation of a brake pedal 1 performed while the vehicle is traveling, a brake lock means 6 for applying a hydraulic lock on the hydraulic brake device 4, 5 and releasing the hydraulic lock, a brake pedal operation detection means 22 for detecting an operation of the brake pedal 1, and a control means 10 for controlling the brake lock means 6 so as to apply the hydraulic lock on the hydraulic brake device 4, 5 upon detecting via the brake pedal operation detection means 22 a predetermined depressing operation of the brake pedal 1.

Abstract: A locking mechanism for installing between a master cylinder and a brake line includes a housing having an internal bore, an inlet port, a passage, and an outlet port. A reciprocating piston is movable within the bore. A locking lever is coupled to the reciprocating piston for actuating the reciprocating piston. A fastener having an internal fluid passage for providing fluid communication between the passage and the master cylinder secures the housing to the master cylinder. The locking lever is moveable between a first position, wherein the hydraulic fluid can flow freely between the master cylinder and the brake line for engaging and disengaging the vehicle brake and a second position, wherein the hydraulic fluid is prevented from returning to the master cylinder for maintaining the vehicle brake in an engaged state.

Abstract: An apparatus for externally controlling one or more brakes on a vehicle having a pressurized fluid braking system. The apparatus can include a pressurizable vessel that is adapted for fluid-tight coupling to the braking system. Impact to the rear of the vehicle by a pursuit vehicle, shooting a target mounted on the vehicle or sending a signal from a remote control can all result in the fluid pressures in the braking system of the vehicle being modified so that the vehicle is stopped and rendered temporarily inoperable. A control device can also be provided in the driver's compartment of the vehicle for similarly rendering the vehicle inoperable. A driver or hijacker of the vehicle preferably cannot overcome the stopping action from the driver's compartment.

Abstract: Hydraulic pressure for wheel lock is kept by trapping suitably pressurized brake fluid between a brake power unit (34) and hydraulic actuators at the brake calipers or shoes at the wheels (22) by a locking mechanism (120) that acts on the brake pedal shaft (128) independently of the brake pedal.

Abstract: The invention relates to a braking system for motor vehicles, the system comprising a hydraulic operating brake provided with two separate line circuits (14, 18) connecting a main brake cylinder (20) to brake devices (12) associated with the vehicle wheels by means of an antilock device (16), and a parking brake. According to the invention, an auxiliary cylinder (26) comprising an auxiliary piston (32) that can be displaced by an actuating device (48) and acts on the brake devices (12) during the displacement thereof by means of the liquid columns in the line circuit, and a valve (42) for locking the line connection between the main brake cylinder (20) and the respective brake devices (12), are arranged in at least one of the line circuits (18) between the antilock device (16) and the main brake cylinder (20).

Abstract: A braking force retaining unit has a cut-off valve and a control unit. The cut-off valve retains predetermined brake hydraulic pressure at the wheel cylinders until a predetermined releasing condition is established, even after the depression of a brake pedal is released when a vehicle is stopped. When the predetermined releasing condition is established, the retained brake hydraulic pressure is released, when the depression of the brake pedal is released, the control unit controls the cut-off valve so as to retain the brake hydraulic pressure while reducing the retained brake hydraulic pressure at a first reduction rate. When the predetermined releasing condition is established, the control unit controls the cut-off valve so as to allow the retained brake hydraulic pressure to be reduced at a second reduction rate which is faster than the first reduction rate.

Abstract: A brake actuating assembly includes a cam member that has first and second cam surfaces. A first piston in a first hydraulic circuit is selectively enabled to axially translate the cam member from a released position to an actuation position while an actuation piston moves friction surfaces into engagement with a rotor to effect a brake application. During a brake application, pressurized fluid is diverted away from a second piston in a second hydraulic circuit that is later enabled to return the cam member to the released position. A resilient assembly selectively engages the second cam surface to obliquely move the cam member toward the actuation piston during a brake application. An electrically actuable valve supplies pressure fluid that acts on and moves the resilient assembly away from the second cam surface and thereafter allow a second hydraulic piston to return cam member to the released position.

Abstract: A pneumatic actuator is integrated into a foot control valve. It includes a pneumatically activated piston that applies a force to the foot control valve primary piston which, in turn, applies the vehicle brake system. The piston is configured to allow the pedal or treadle actuated plunger to push through the pneumatic actuator and apply the brake system. This finds particular use as an add-on feature for pre-trip inspection systems, as a working brake system, etc.

Abstract: A locking device for immobilizing trailers to prevent unauthorized movement or theft of the trailer by venting the compressed air that is used to release the brakes. The locking device has a controller unit, a control valve and power source mounted inside a housing. A control mechanism, such as a keypad or key lock system, is located outside of the housing, preferably on a trailer wall. The inlet on the control valve connects to the brake line that delivers compressed air to the trailer's compressed air-operated brakes. In the locked condition, the control valve is set so compressed air vents out the control valve's outlet, preventing release of the brakes. When the proper lock code, key or other signal is received, the control valve closes the outlet to stop the venting and allow the brakes to be released.

Abstract: An emergency brake lever system for a recreational vehicle with a lever-actuated braking mechanism for precluding movement of the recreational vehicle upon the actuation thereof. Also included is a tether for wearing by a rider of the recreational vehicle. A release mechanism is coupled to the braking mechanism and the tether for actuating the braking mechanism upon the rider inadvertently falling off of the recreational vehicle.

Abstract: A device for activating a parking brake includes a hydraulic cylinder-piston unit and a pressure source. The hydraulic cylinder-piston unit is operatively connected to the parking brake to activate the parking brake. The pressure source supplies pressure medium to the hydraulic cylinder-piston unit, wherein the cylinder-piston unit is configured to have pressure medium applied to both sides of the piston of the hydraulic cylinder-piston unit.

Abstract: A hydraulic braking system for wheel-borne devices permits brake actuation independent of operator-actuation of a normal brake valve. A braking circuit includes a flow line, a return line, and one or more wheel brakes. An electrically actuated valve system is installed parallel to the brake valve, which connects the wheel brakes to the flow line when actuated, and closes off the return line. Motor vehicles represent an important area of application for the invention.

Abstract: A brake fluid pressure retaining unit for retaining brake fluid pressure within a wheel cylinder after releasing a brake pedal is disclosed. The brake fluid pressure retaining unit includes a brake fluid pressure reduction speed control device for retaining reduction speed of the brake fluid pressure within the wheel cylinder less than that of brake pedal load applied by a driver. The brake fluid pressure reduction speed control device may be formed by a restriction in a brake fluid pressure circuit arranged between a master cylinder at which the brake fluid pressure is generated in accordance with a brake pedal load applied by the driver and the wheel.

Abstract: A pneumatic actuator is integrated into a foot control valve. It includes a pneumatically activated piston that applies a force to the foot control valve primary piston which, in turn, applies the vehicle brake system. The piston is configured to allow the pedal or treadle actuated plunger to push through the pneumatic actuator and apply the brake system. This finds particular use as an add-on feature for pre-trip inspection systems, as a working brake system, etc.

Abstract: A brake control device has a master cylinder, wheel cylinder, and a solenoid valve disposed in a conduit between the master cylinder and the wheel cylinder. When a brake pedal happens to be returned at sudden braking, at an idle stop or at vehicle stop on a sloping road, the solenoid valve is controlled at a duty rate based on a difference between a peak value of master cylinder and an actual value of master cylinder reducing so that wheel cylinder pressure is held to a value higher than master cylinder pressure.

Abstract: In most vehicles, it is necessary to manually operate the parking brake whenever the vehicle is stopped. The manual brake operation is fatiguing and liable to make the driver feel that the operation is troublesome. A controller 10 controls a cut-off valve 8 to close in a vehicle stopping condition, and even if a brake pedal 1 is released, a pressure within a wheel cylinder 6 is held to thereby maintain a braking force. Also, when an accelerator pedal 11 is depressed when the brake hydraulic pressure is maintained within the wheel cylinder 6, the controller 10 controls the cut-off valve 8 in the open condition so that the pressure within the wheel cylinder 6 is reduced to release the brake.

Abstract: Apparatus is disclosed for controlling the operational states of a motor vehicle comprising a maneuvering console including a maneuvering lever, a pivot hinge for the maneuvering lever so that the maneuvering lever can be actuated into a number of positions corresponding to the operational states of the motor vehicle, the pivot hinge being mounted to permit pivoting of the maneuvering lever with respect to the maneuvering console about an unlimited number of spatial pivot axes, a plurality of hydraulic pistons and cylinders mechanically coupled to the maneuvering lever for selectively limiting the pivoting movement of the maneuvering lever, a plurality of sensors for detecting a maneuvering force applied to the maneuvering lever and the position of the maneuvering lever so that the pivoting movement of the maneuvering lever can be selectively limited by the plurality of hydraulic pistons and cylinders based upon those detections, and a controller for controlling the plurality of hydraulic pistons and cylinder

Abstract: A direct acting release cap for air brake control valves in trains which will allow for the manipulation of the valve characteristics from a direct brake release to a graduated brake release without removal of the cap from the body of the valve. This is accomplished through longitudinal movement of a spool, which directs internal air passages that control valve characteristics. The present invention eliminates the requirement of removing the direct acting release cap from the valve in order to change the working characteristics of the valve, thus resulting in a time savings for the operator.

Abstract: The invention is based on a system for controlling the braking action in a motor vehicle by means for adjusting the braking action independently of the driver's actuation. Upon recognition of a preselectable operating mode, for which at least the longitudinal velocity of the vehicle is found to be zero, a certain braking action is exerted. An operating mode of the type in question can be present when, for example, the above-mentioned creep suppression or the above-mentioned hillholding is desired. The core of the invention consists in that, upon determination of a preselectable longitudinal vehicle velocity during this operating mode, the braking action is increased independently of the driver. As a result of the monitoring of the longitudinal vehicle velocity according to the invention during the operating mode (creep suppression mode or hillholder mode), any motion of the vehicle unwanted by the driver is reliably prevented.

Abstract: A hill-holder function is initiated when the brake pedal is actuated while the vehicle is in at least one operating state. The braking force is thus locked into at least one wheel brake independently of the extent to which the pedal is actuated. This braking force is decreased again when the brake pedal is released.

Abstract: A vehicle anti-theft device that blocks and unblocks the flow of hydraulic fluid between a vehicle's master brake cylinder and wheel brake cylinder. When the invention is in a fluid blocking position, it locks the brakes and prevents movement of the vehicle on its wheels. Conversely, when the invention is in the nonblocking position, the brakes are unlocked and the wheels turn freely as in normal operation. The anti-theft device can be deactivated within the vehicle or by remote control.

Abstract: A method for preventing unwanted rolling away of a stationary vehicle maintains a brake pressure in wheel brake cylinders. The brake pressure is maintained in dependence on the actuation of the brake pedal, and is maintained only if the current brake pressure exceeds a brake pressure corresponding to the holding pressure by a certain amount. This brake pressure can be applied at will by the driver.

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: An antitheft device is provided for a vehicle such as a tractor/trailer combination, with an engine operable to develop pneumatic pressure in a reservoir during operation of the engine, and a pneumatic conduit leading from the reservoir to an operational load, preferably a brake release mechanism. The antitheft device preferably has at least two controllable valve along the pneumatic conduit, each with at least two positions including a first position at which the pneumatic conduit is open through the valve from the reservoir to the operational load, and a second position at which the fluid conduit is closed between the reservoir and the load by the valve means to disable the operational load. Air pressure is diverted at the valve to a branch coupling the reservoir through to an alarm such as an air horn. The antitheft device can be included in a tractor or a trailer, and preferably valves and alarms are provided in both.

Abstract: A brake lock system is used in a vehicle having a brake line which feeds brake fluid to at least one brake member. The system comprises a brake line fittable housing having at least one fluid inlet and at least one fluid outlet. A flow control which controls the flow of brake fluid from each inlet to each outlet is provided within the housing. The flow control is movable from a first position which allows two way flow between the inlet and the outlet to a second position only allowing one way flow from the inlet to the outlet. Also provided within the housing is an operating member for moving the flow control. A controller which controls the operating member is provided remotely of the housing and a flexible drive shaft connects the controller to the operating member. The use of the flexible drive shaft permits a mounting position for the controller at a location different from that of the housing within the vehicle.

Abstract: A brake apparatus of a motor vehicle equipped with an automatic transmission includes a brake circuit for applying a fluid pressure to wheel brakes to allow the wheel brakes to generate braking forces. The hydraulic pressure is generated by fluid pressure generating means according to an operated state of a brake pedal. The brake apparatus further includes a shift operating unit having a selector member that is placed in a selected shift position including a parking position for establishing a selected shift position of the automatic transmission. A control valve is disposed between the fluid pressure generating means and the wheel brakes in the brake circuit, such that the control valve is selectively placed in a first state wherein the wheel brakes communicate with the fluid pressure generating means, and a second state wherein the wheel brakes are disconnected from the fluid pressure generating means.

Abstract: A control valve lock for a vehicle air brake system is described whereby to secure the parking brakes of the vehicle in an engaged locked position. The lock is securable to the valve actuating rod on the dashboard control valve and is comprised essentially of a block-like base member to which is secured a large actuating knob. A lock cylinder extends through a portion of the knob and the base member and aligns internal locking cavities between the connecting shaft of the knob and the base member whereby the locking dog of the lock cylinder can engage in the cavities to secure the knob in a retracted position whereby to lock the brakes of the vehicle. In order to unlock the brakes, it is necessary to insert a key in the key cylinder to liberate the knob to permit it to be pushed inwardly whereby the dashboard control valve can supply air to the parking brake cylinder to release the brakes.