Brake system with anti-lock control and traction slip control

Claim 1

A brake system with anti-lock control and traction slip control for automotive vehicles including front and rear wheel brakes, said system comprising, in combination: a pedal-actuated master cylinder having first and second working chambers respectively connected to the front wheel brakes by way of first and second normally open control valves (11, 13); an unpressurized reservoir; an auxiliary pressure source having a normally open shut-off valve (8) and a pressure control valve (7) serially coupled between a suction side and a pressure side of said pressure source; first and second non-return valves respectively connected between said pressure side of said pressure source and said front wheels; a third non-return valve connected between said pressure side of said pressure source and the rear wheel brakes; said pressure control valve (7) having a pressure control input connected to one of said working chambers and being operative to close the serial connection of said pressure control valve (7) and said shut-off valve (8) proportionally in response to pressure in said one of said working chambers; a plurality of normally open pressure control valves respectively connected between said non-return valves and said wheel brakes; a plurality of normally closed pressure control valves respectively connected between said reservoir and said wheel brakes; and, said plurality of normally open valves and said plurality of normally closed valves being responsive to anti-lock control and traction slip control signals to provide brake pressure variation in response thereto.