Brake fluid pressure control apparatus in skid control system

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 comprising:

• (a) a fluid pressure control valve device arranged between a master cylinder and wheel cylinder of said brake for the wheel, said fluid pressure control valve device receiving control signals of a control unit measuring the skid condition of the wheel to control the brake fluid pressure to said wheel cylinder;
• (b) a hydraulic reservoir 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 said fluid pressure control valve device from said wheel cylinder;
• (c) a pressure fluid supply conduit connecting said master cylinder with said fluid pressure control valve device;
• (d) a fluid pump for returning the brake fluid from said hydraulic reservoir into said pressure fluid supply conduit;
• (e) a first check valve arranged in said pressure fluid supply conduit, said first check valve being opened when the brake fluid flows from said master cylinder toward said fluid pressure control valve device, and the outlet of said fluid pump being connected to said pressure fluid supply conduit between said first check valve and said fluid pressure control valve device;
• (f) a pressure fluid return conduit connecting said master cylinder with said wheel cylinder;
• (g) a second check valve arranged in said pressure fluid return conduit, said second check valve being opened when the brake fluid flows from said wheel cylinder toward said master cylinder;
• and
• (h) means for receiving the brake fluid discharged from said fluid pump, said receiving means being a fluid pressure adjusting valve having a chamber, said brake fluid discharged from said fluid pump being led into said chamber of the fluid pressure adjusting valve and said chamber, when said valve is opened, communicating with said hydraulic reservoir.