PURPOSE: To carry out the proper brake control on the start of the turn during the brake application, by instaling a load-sensitive type hydraulic control valve in a hydraulic circuit between a master cylinder and a rear wheel cylinder and interposing a decompression means for reducing the hydraulic pressure, accompanied with the rise of the car height, between the load-sensitive type hydraulic control valve and the rear wheel cylinder.

CONSTITUTION: When the lateral acceleration speed is generated on a vehicle through the turn of the vehicle, and the car height lowers on the corner outside, springs 7A and 7B extend in a valve unit 6R interposed between a suspension arm in the side where the car height increases and a car body, and the force for pushing a piston 7 upward reduces, and the liquid pressure bent point changes Accordingly, the downward urging force of the piston 7 reduces, and the contact between a valve part 71 and a aealing part 63 formed in a piston chamber 61A is facilitated, and even if the brake hydraulic pressure is low, the communication between a master cylinder and a rear wheel cylinder is cut off. Further, a piston 8 is slided downward by the spring 7B, and the hydraulic pressure on the rear wheel cylinder side is reduced.