Brake fluid pressure control apparatus in skid control system

Claim 1

In a brake fluid pressure control apparatus in a skid control system for a vehicle having at least one wheel and a brake for the wheel including a fluid pressure control valve device arranged in a conduit between a master cylinder and a wheel cylinder of a brake for the wheel, said fluid pressure control valve device receiving control signals of a control unit means measuring the skid condition of the wheel to control the brake fluid pressure to said wheel cylinder; a hydraulic reservoir which is connected through a first conduit to a discharging port of said fluid pressure control valve device and which, when the brake fluid pressure to said wheel cylinder is decreased with control of said fluid pressure control valve device, reserves the brake fluid discharged through the discharging port of said fluid pressure control valve device from said wheel cylinder; and a fluid pump capable of pressurizing and supplying the brake fluid from said hydraulic reservoir into said wheel cylinder, the improvements in which a valve apparatus capable of changing between a cutoff state and a communicating state is arranged in a second conduit between said hydraulic reservoir and said fluid pump, the suction side of said fluid pump connected to said valve apparatus and the discharging side of said fluid pump connected to the wheel cylinder, said control unit means controlling said fluid pump such that said fluid pump continues to be driven during the anti-skid control operation after a first control signal for decreasing the brake fluid pressure to said wheel cylinder is generated from said control unit means, said valve apparatus so controlled as to be put into said cut-off state by said control means, at least when control signals for again decreasing the brake fluid pressure to said wheel cylinder are generated from said control unit means.