ANTI-SKID BRAKE CONTROL DEVICE

PURPOSE:To enable a pressure fluctuation such as pump pulsation to be effectively absorbed in an anti-skid brake control device having two brake systems by changing the capacity of two oil chambers of a cylinder via the stroke of a floating piston. CONSTITUTION:A brake circuit comprises the first and second brake systems A and B, and has the first and second flow passage selector control valves 12 and 13 for selecting continuity between each of a wheel cylinders 2 and 3, and the oil chamber 1a of a master cylinder 1, or continuity between each of the wheel cylinders 2 and 3, and a low pressure accumulator (sump) 11. The low pressure accumulator 11 is connected via a nonreturn valve 14 to a pump 16 driven with a motor 15. also, the pump 16 is connected via another nonreturn valve 17 to a volume chamber 18 for absorbing the pulsation thereof. In this case, a floating piston 24 energized with a pair of right and left springs 25 and 26, and normally retained at the center position is provided in a single cylinder 23 for the formation of the volume chamber 18, and oil chambers 27 and 28 are cellularized at the right and left sides of the piston 24.