A brake system for a motor vehicle includes a control valve, a redundancy valve, a brake valve, a brake cylinder, a pressure fluid source, an electronic control unit, a parking lock, and a depressurized tank. The control valve and the redundancy valve are mechanically preloaded in a closed state, whereas the brake valve is mechanically preloaded in an open state. The electronic control unit is configured to control the brake valve so that it moves into a closed state so that pressure fluid flows out of the brake cylinder via the brake valve directly into the depressurized tank, and no pressure fluid is fed into the brake cylinder via the control valve or the redundancy valve and the brake valve, if the control valve or the redundancy valve remains in an open state due to a mechanical defect and otherwise should be in the closed state.

A brake system for a motor vehicle includes a control valve, a redundancy valve, a brake valve, a brake cylinder, a pressure fluid source, an electronic control unit, a parking lock, and a depressurized tank. The control valve and the redundancy valve are mechanically preloaded in a closed state, whereas the brake valve is mechanically preloaded in an open state. The electronic control unit is configured to control the brake valve so that it moves into a closed state so that pressure fluid flows out of the brake cylinder via the brake valve directly into the depressurized tank, and no pressure fluid is fed into the brake cylinder via the control valve or the redundancy valve and the brake valve, if the control valve or the redundancy valve remains in an open state due to a mechanical defect and otherwise should be in the closed state.

A parking brake for a body mounted brake cylinder having either a single locking mechanism cooperates with a threaded shaft that is centrally mounted within the brake cylinder or with multiple locking mechanisms that are positioned symmetrically about the centerline of the brake cylinder push rod so that the push or piston rod can still accommodate arcuate motion of the level of the braking system. The locking mechanism may be controlled by a mechanical linkage or through a pneumatic circuit. Activation of the locking mechanisms prevents axial movement of the brake piston. As a result, engagement of the locking mechanism may be used to prevent a release of the brakes after then have been applied to provide an automatic parking brake.

A parking brake for a body mounted brake cylinder having either a single locking mechanism cooperates with a threaded shaft that is centrally mounted within the brake cylinder or with multiple locking mechanisms that are positioned symmetrically about the centerline of the brake cylinder push rod so that the push or piston rod can still accommodate arcuate motion of the level of the braking system. The locking mechanism may be controlled by a mechanical linkage or through a pneumatic circuit. Activation of the locking mechanisms prevents axial movement of the brake piston. As a result, engagement of the locking mechanism may be used to prevent a release of the brakes after then have been applied to provide an automatic parking brake.

A parking brake for a body mounted brake cylinder having either a single locking mechanism cooperates with a threaded shaft that is centrally mounted within the brake cylinder or with multiple locking mechanisms that are positioned symmetrically about the centerline of the brake cylinder push rod so that the push or piston rod can still accommodate arcuate motion of the level of the braking system. The locking mechanism may be controlled by a mechanical linkage or through a pneumatic circuit. Activation of the locking mechanisms prevents axial movement of the brake piston. As a result, engagement of the locking mechanism may be used to prevent a release of the brakes after then have been applied to provide an automatic parking brake.

A parking brake for a body mounted brake cylinder having either a single locking mechanism cooperates with a threaded shaft that is centrally mounted within the brake cylinder or with multiple locking mechanisms that are positioned symmetrically about the centerline of the brake cylinder push rod so that the push or piston rod can still accommodate arcuate motion of the level of the braking system. The locking mechanism may be controlled by a mechanical linkage or through a pneumatic circuit. Activation of the locking mechanisms prevents axial movement of the brake piston. As a result, engagement of the locking mechanism may be used to prevent a release of the brakes after then have been applied to provide an automatic parking brake.

A vehicle brake booster system includes a reservoir, a pump, and a brake booster. The brake booster includes an input member adapted to receive a manual braking input force and an output member adapted to apply a braking output force to a master cylinder. A supply line couples the pump to the brake booster, and a return line couples an outlet of the brake booster to the reservoir. A flow of hydraulic fluid pumped to the brake booster provides a boost factor by which the braking output force exceeds the braking input force. The brake booster is hydraulically lockable by a first valve in the supply line and a second valve in the return line such that when the first and second valves are closed, a quantity of hydraulic fluid is trapped within the brake booster to maintain operation of the brake booster without continued operation of the pump.

A brake system for a rail vehicle including a brake cylinder having a housing, a port on the housing for receiving fluid pressure signals, a pressure piston carried inside the housing, and a shaft connected to the pressure piston. The pressure piston and the shaft form an actuator to apply and release the brakes of the rail vehicle. A parking brake locking mechanism is connected to the actuator and is responsive to fluid signals from a fluid charged brake pipe to lock and unlock the parking brake locking mechanism. Further included is a manual release device configured to unlock the parking brake locking mechanism from the locked position.

A brake system for a rail vehicle including a brake cylinder having a housing, a port on the housing for receiving fluid pressure signals, a pressure piston carried inside the housing, and a shaft connected to the pressure piston. The pressure piston and the shaft form an actuator to apply and release the brakes of the rail vehicle. A parking brake locking mechanism is connected to the actuator and is responsive to fluid signals from a fluid charged brake pipe to lock and unlock the parking brake locking mechanism. Further included is a manual release device configured to unlock the parking brake locking mechanism from the locked position.

A brake unit for a vehicle, in particular a rail vehicle, has a brake cylinder, a brake piston and a device for adjusting a clearance. The latter has two first stops that strike against each other when the brake unit is opened. One of the first stops is formed on a blocking element that is functionally connected to the brake piston. In order to be able to open the brake unit beyond the clearance, a blocking member is in engagement with the blocking element under the force of a pre-stressing spring. The blocking element is blocked by the blocking member when the first stops strike. Actuators displace the blocking member that is in engagement with the blocking element counter to a force of the pre-stressing spring into a position detached from the blocking element.