A master mounting for a hydraulic actuation member has a housing, which has a compensating chamber with an interior and a cylinder. The master mounting also has a piston guided in the cylinder. The cylinder and the compensating chamber are connected in at least one position of the piston by a communication channel. At least one overflow channel is disposed at least at the opening of the communication channel in the cylinder wall.

A master mounting for a hydraulic actuation member has a housing, which has a compensating chamber with an interior and a cylinder. The master mounting also has a piston guided in the cylinder. The cylinder and the compensating chamber are connected in at least one position of the piston by a communication channel. At least one overflow channel is disposed at least at the opening of the communication channel in the cylinder wall.

An electric brake system is disclosed. The electric brake system comprises a hydraulic pressure supply device configured to generate hydraulic pressure using a hydraulic piston which is activated by means of an electrical signal that is output corresponding to a displacement of a brake pedal, and including a cylinder block, first and second hydraulic pistons movably accommodated inside the cylinder block, and first and second pressure chambers comparted by the first and second hydraulic pistons, a first hydraulic circuit configured to connect a first hydraulic flow path communicating with the first pressure chamber to one or more wheel cylinders, a second hydraulic circuit configured to connect a second hydraulic flow path communicating with the second pressure chamber to one or more wheel cylinders, and a balance valve configured to open and close a balance flow path connecting the first hydraulic flow path to the second hydraulic flow path.

An electric brake system is disclosed. The electric brake system comprises a hydraulic pressure supply device configured to generate hydraulic pressure using a hydraulic piston which is activated by means of an electrical signal that is output corresponding to a displacement of a brake pedal, and including a cylinder block, first and second hydraulic pistons movably accommodated inside the cylinder block, and first and second pressure chambers comparted by the first and second hydraulic pistons, a first hydraulic circuit configured to connect a first hydraulic flow path communicating with the first pressure chamber to one or more wheel cylinders, a second hydraulic circuit configured to connect a second hydraulic flow path communicating with the second pressure chamber to one or more wheel cylinders, and a balance valve configured to open and close a balance flow path connecting the first hydraulic flow path to the second hydraulic flow path.

A tandem master brake cylinder for a hydraulic motor vehicle brake system, which is impinged upon by a pneumatic brake booster, including at least one piston which is displaceable in a housing and has a plurality of follow-up connections the follow-up connections allowing a hydraulic connection between the pressure chamber and a pressureless follow-up chamber at the start of a braking operation. At least some of the follow-up connections are formed as transverse bores through a wall of at least one piston and are arranged at a same distance relative to the piston edge in a main plane, wherein the overtravel thereof by the sealing collar defines a closure path of the piston. In order to allow a smooth, quiet and yet sufficiently reliable braking initiation, the follow-up connections are arranged in a distributed manner on at least three planes, the planes being arranged at a distance to one another and in parallel to the piston edge.

A tandem master brake cylinder for a hydraulic motor vehicle brake system, which is impinged upon by a pneumatic brake booster, including at least one piston which is displaceable in a housing and has a plurality of follow-up connections the follow-up connections allowing a hydraulic connection between the pressure chamber and a pressureless follow-up chamber at the start of a braking operation. At least some of the follow-up connections are formed as transverse bores through a wall of at least one piston and are arranged at a same distance relative to the piston edge in a main plane, wherein the overtravel thereof by the sealing collar defines a closure path of the piston. In order to allow a smooth, quiet and yet sufficiently reliable braking initiation, the follow-up connections are arranged in a distributed manner on at least three planes, the planes being arranged at a distance to one another and in parallel to the piston edge.

An object is to provide a master cylinder that ensures the responsivity during brake actuation, improves a release delay during brake release, ensures the responsivity during automatic braking, and quickly releases the residual pressure in the hydraulic chamber. The master cylinder includes a cylinder body having a cylinder hole, a piston slidably inserted into the cylinder hole, the piston partitioning a hydraulic chamber, a communicating passage provided in the cylinder body, the communicating passage communicating with a reserver, a relief port formed in the piston, the relief port performing communication between the communicating passage and the hydraulic chamber, and a seal member housed in a recess portion in an inner peripheral surface of the cylinder hole of the cylinder body, the piston slidably passing through the seal member, the seal member performing sealing between the inner peripheral surface of the cylinder hole and an outer peripheral surface of the piston, the communicating passage communicating with the relief port during non-actuation, the piston moving to block the communicating passage from the relief port using the seal member during actuation, in which a flow passage control member for opening and closing the relief port is provided in a part of the relief port close to the hydraulic chamber.

An object is to provide a master cylinder that ensures the responsivity during brake actuation, improves a release delay during brake release, ensures the responsivity during automatic braking, and quickly releases the residual pressure in the hydraulic chamber. The master cylinder includes a cylinder body having a cylinder hole, a piston slidably inserted into the cylinder hole, the piston partitioning a hydraulic chamber, a communicating passage provided in the cylinder body, the communicating passage communicating with a reserver, a relief port formed in the piston, the relief port performing communication between the communicating passage and the hydraulic chamber, and a seal member housed in a recess portion in an inner peripheral surface of the cylinder hole of the cylinder body, the piston slidably passing through the seal member, the seal member performing sealing between the inner peripheral surface of the cylinder hole and an outer peripheral surface of the piston, the communicating passage communicating with the relief port during non-actuation, the piston moving to block the communicating passage from the relief port using the seal member during actuation, in which a flow passage control member for opening and closing the relief port is provided in a part of the relief port close to the hydraulic chamber.

A master brake cylinder arrangement for a hydraulic motor vehicle brake system, comprising a master brake cylinder housing with a cylindrical recess and at least one substantially annular groove which is oriented transversally to a longitudinal axis of the cylindrical recess and which is axially delimited by a protruding housing portion. The master brake cylinder arrangement also comprises at least one pressure piston which can be displaced axially in the cylindrical recess of the master brake cylinder housing and which is guided in a sealed manner by means of at least one seal element arranged in the groove. The housing portion has an edge portion which faces the seal element and an edge portion which faces away from the seal element when viewed in the axis-containing longitudinal section. The edge portion facing the seal element and the edge portion facing away from the seal element have a curved contour when viewed in the axis-containing longitudinal section, the edge portion facing the seal element and the edge portion facing away from the seal element being curved to different degrees.

A drilling of a hydraulic unit of a service brake assembly of a vehicle hydraulic-power brake system.