A method for operating a hydraulic brake system of a motor vehicle, comprising a pressure generating device used to build up additional brake pressure in a master brake cylinder or in addition to a master brake cylinder and in opposition to further pedal actuation wherein the additional pressure is a function of the pedal actuation travel distance. A method that reduces the limitations of a braking system's physical parameters on the build-up of additional braking pressure.

Disclosed is a hydraulic brake system comprising a master cylinder forming a braking hydraulic pressure according to an operation of a brake pedal, wheel brakes provided at a front wheel and a rear wheel, respectively, to provide a braking force by receiving the braking hydraulic pressure of the master cylinder, solenoid valves provided at an inlet side and an outlet side of each of the wheel brakes to control a flow of the braking hydraulic pressure, a low pressure accumulator temporarily storing oil discharged from the wheel brake during a pressure reducing braking in which the solenoid valve operates, a pump configured to compress oil stored in the low pressure accumulator such that the oil is discharged toward the wheel brake or the master cylinder according to a demand, and an orifice provided at an outlet side of the pump, wherein the orifice includes an outer case and an inner case provided to form a space between the outer case and the inner case while assembled to the outer case, a first oil passage passing through the inner case, and a second oil passage provided in the space between the outer case and the inner case, and the first oil passage and the second oil passage have lengths different from each other.

A hydraulic unit for a vehicle brake apparatus having a master cylinder and a wheel cylinder includes a housing formed with a pipe line connecting between the master cylinder and the wheel cylinder, a pump disposed in the housing for sucking and discharging a brake fluid to boost pressure of the brake fluid, and a reservoir piston disposed in a hole formed in the housing so as to be movable slidably back and forth, the reservoir piston partitioning a reservoir chamber within the hole for temporarily storing the brake fluid discharged from the wheel cylinder. The hydraulic unit further includes a cover disposed in the hole to close one end on an atmospheric side of the hole, the cover being formed with a fluid reservoir chamber for storing the brake fluid leaking from the pump.

A non-return valve having a valve opening spring is positioned between an unpressurized brake fluid reservoir and a brake master cylinder of a hydraulic vehicle power brake system having an externally-powered brake pressure generator. The non-return valve allows for a flow-through in the direction of the brake master cylinder and blocking against a return flow from the brake master cylinder into the brake fluid reservoir starting at a counterpressure in the brake master cylinder specified by the valve opening spring.

A braking apparatus includes a pedal configured to be pressed by a driver to cause braking, a master cylinder part in which pressure of oil is amplified by the pressure applied to the pedal part, a block part configured to be supplied with the oil from the master cylinder. An electric pump part is inserted into block part and is configured to amplify the pressure of the oil in the block part. A wheel cylinder part is connected to the block part that is configured to receive pressurized oil from the block part and to generate a braking force for a wheel. The block part defines a space into which the electric pump part is inserted and a plurality of oil movement paths that are connected to the space and separate from each other when the electric pump part is inserted into the space.

A method for operating a braking system for a motor vehicle. The braking system includes at least one hydraulically actuatable wheel brake, a controllable pressure-generating device for providing a hydraulic pressure in a brake circuit including the at least one wheel brake, and an actuating element that is actuatable by a driver and is intended for specifying a braking request. The brake circuit is assigned a sensor for detecting an actual hydraulic pressure in the brake circuit. The pressure-generating device is controlled depending on the braking request and the actual hydraulic pressure detected in the brake circuit by the sensor. An efficiency value of the pressure-generating device is ascertained and stored depending on the braking request and the detected actual pressure. In the event of a function error of the sensor, the pressure-generating device is controlled at least depending on the braking request and the stored efficiency value.

A housing for a piston-cylinder device of a vehicle brake system. The housing has at least one pressure compensation groove structured into at least one inner surface of the housing. The groove extends in each case starting at least from the pre-chamber and up to at least the first chamber in such a way that, during the adjusting movement of the first piston component oriented in the direction away from the pre-chamber toward the first chamber, at least one gaseous and/or liquid medium present in the first chamber can be transferred out of the first chamber through the at least one pressure compensation groove into the pre-chamber. A piston-cylinder device for a vehicle brake system is also described having at least one pressure compensation path.

A power piston in a power cylinder borehole of a hydraulic block of a hydraulic power unit of a hydraulic power vehicle braking system is only guided radially in an axially delimited guide section. The power cylinder borehole is configured with a larger diameter axially outside the guide section. A brake fluid channel extends through the guide section up to an opening of a brake fluid line.

A method for controlling a hydraulic volume in a system including a power brake hydraulically connected to a driving dynamics control. The method includes generating a control signal using the driving dynamics control and providing a control signal for the power brake, for providing hydraulic volumes for the driving dynamics control. The method further includes performing a control of the driving dynamics, returning the hydraulic volume from the driving dynamics control, after the control of the driving dynamics has ended, to a reservoir via previously opened circuit isolating valves, via which the driving dynamics control is connectable to the reservoir. The method also includes closing the circuit isolating valves and controlling the brake pressure in the driving dynamics control using a power piston arranged in a power cylinder, in the event that an active braking maneuver is initiated before or while returning the hydraulic volume.

A braking system for a vehicle is disclosed, the braking system configured for selectively applying pressure to and relieving pressure from at least two pressure connections for brake actuators. The braking system comprises an electro-fluidic braking module with an electrically-actuatable pressure generating unit, a master cylinder module comprising a fluidic brake master cylinderactuatable by a brake pedal, wherein the electro-fluidic braking module and the master cylinder module are coupled to the pressure connections via at least one selector valve. The braking system also has a control unit which is designed to activate the electro-fluidic braking module and the at least one selector valve for applying pressure to the pressure connections, and to activate the electro-fluidic braking module to increase a fluid pressure in the master cylinder module while the at least one selector valve is in the first switching position. A method for operating a braking system is also provided.