BRAKE PRESSURE REGULATOR

PURPOSE: To reduce manufacturing costs by providing a valve structure body combining the function of controlling pressure from a pressure supply source at the time of traction skid control and the function of controlling pressure from a pressure fluid source according to booster pressure at the time of anti- locking control. CONSTITUTION: In a brake pressure controller allowing anti-locking control and traction lock skid control of a hydraulic brake system, a valve structure body V is interposed between a pressure fluid accumulator 19 and a brake booster 5 and between an accumulator 9 and an anti-locking pressure controller 14. This valve structure body V is provided with a ball 58 opened by the leftward movement of a piston 56 by accumulator pressure acting upon an inlet 55 at the time of traction skid control, and the valve structure body V is so constituted as to open and close a ball valve 38 by the displacement of pistons 56, 57 by booster pressure corresponding to brake pressure acting upon inlets 64, 65 at the time of braking operation.