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A system and method for regulating a brake pressure in a brake chamber by a master brake cylinder piston, this master brake cylinder piston is associated with a brake pedal and piston rod that are acted upon by a braking force. When the brake pedal is actuated with a braking force, the master brake

A system and method for regulating a brake pressure in a brake chamber by a master brake cylinder piston, this master brake cylinder piston is associated with a brake pedal and piston rod that are acted upon by a braking force. When the brake pedal is actuated with a braking force, the master brake cylinder piston is simultaneously placed under pressure as a function of the pedal travel, and covers a longer travel than the brake pedal and piston rod.

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A hydraulic brake system having wheel brake cylinders (25, 26, 29, 30) for braking driven and non-driven wheels (27, 28, 31, 32), a master brake cylinder (7) which supplies the wheel brake cylinders with brake pressures, said master brake cylinder having a housing part (6) and at least one first mas

A hydraulic brake system having wheel brake cylinders (25, 26, 29, 30) for braking driven and non-driven wheels (27, 28, 31, 32), a master brake cylinder (7) which supplies the wheel brake cylinders with brake pressures, said master brake cylinder having a housing part (6) and at least one first master brake cylinder piston (12) displaceable in said master cylinder, a brake pedal (1) and a pedal rod (2) which activates a piston rod (10) movable toward said first master brake cylinder piston (12) for activating said first master brake cylinder piston (12), a hydraulic brake booster having a pressure chamber (13) in said master cylinder, said pressure chamber is supplied from a servo pressure source (46, 51) by which the master cylinder piston (12) is displaceable, said piston rod (10) passes into said pressure chamber (13) in a sealed and displaceable manner for mechanically displacing said first master brake cylinder piston (12), a control unit (36), said first travel sensor (39) operative by said brake pedal to send a control signal to said control unit (36) for operation of a booster valve assembly (49, 54) controllable by moving the brake pedal (1), said booster valve assembly is disposed between the servo pressure source (46, 51) and the pressure chamber (13) and between said pressure chamber (13) and a supply container (48), said booster valve assembly (49, 54) is embodied as an electrically controllable magnet valve assembly and is controllable by said control unit (36), a second travel sensor (40) is operative by said first master brake cylinder piston (12) and is electrically connected to the control unit (36), first travel sensor (39) is arranged for outputting electrical signal values that are in a first preselected ratio to displacement travel distances of the pedal rod (2); said second travel sensor (40) is arranged for outputting electrical signal values that are in a second preselected ratio to displacement travel distances of said first master brake cylinder piston (12), said first and second preselected ratios are adapted to one another in such a way that if the values from both travel sensors (39, 40) are equally large, the displacement travel of the master brake cylinder piston (12), is intentionally longer than an associated displacement travel of the pedal rod (2), and the booster valve assembly (49, 54) is controllable via the control unit (36) as a function of a comparison of the first and second values in such a manner that a value from the first travel sensor that varies upon displacement of the pedal rod (2) leads to an approximation of the part of the value from the second travel sensor (40), to the first value from the first travel sensor (39), via displacement of the master brake cylinder piston (12) by imposition of pressure from the servo pressure source (46, 51) via said booster valve assembly (49, 54).