BRAKE SYSTEM FOR VEHICLE

Provided is a brake system (10) for a vehicle including an input side hydraulic system (Pin), an output side hydraulic system (Pout), a first and a second shutoff valves (60b, 60a) to shut off flowing of the brake fluid between the input side hydraulic system and the output side hydraulic system when closed, a first and a second out-valves (128, 130) through which the brake fluid flows into a reservoir unit (132) when opened, and a control unit (150) to control a motor cylinder device (16) of the output side hydraulic system to generate the brake fluid pressure (Bp) according to the operational amount of a brake pedal (12). The control unit opens one or both of the first and the second shutoff valves and the first and the second out-valves when output characteristic (Thigh) of the brake fluid pressure generated by the motor cylinder device shifts from basic characteristic (Tstd).