Skid-controlled brake system with master cylinder pistons and with plungers supported on stationary transverse member

Claim 1

A skid-controlled brake system for use with automotive vehicles, said system comprising a pedal-operated, auxiliary-force-supported brake pressure generator including a master cylinder; main brake lines for connecting the pressure chambers of the master cylinder to the wheel brakes of the vehicle; electromagnetically operable pressure fluid inlet and outlet valves inserted into the main brake lines; hydraulic auxiliary pressure pumps; wheel sensors and electronic circuits for detecting the wheel rotation pattern and for generating electric brake pressure control signals for skid control; pistons in the master cylinder, the pistons being provided with central control valves which valves are open in the brake releasing position to provide communication through pressure fluid conduits between a pressure fluid tank and the pressure chambers, said central control valves being closed in the braking position to close said pressure fluid conduits, the main brake lines being connected to in-flow lines in which are located check valves, the hydraulic pumps being in communication with the in-flow lines and, the main brake lines and the pressure chambers, the suction connections of the hydraulic pump being in communication with the intake tank through an intake line, wherein the central control valve disposed in the piston of the master cylinder comprises a valve body longitudinally displaceable in a recess and cooperating with an opening plunger such that the plunger moves the valve body into its opening position when the piston is in its releasing position, the plunger being supported on a stationary transverse member.