Vehicle brake system

摘要

A hydraulic brake unit (20) applies braking force to a plurality of wheels of a vehicle according to the operation of a brake pedal (24). A pressure increase linear control valve (66) supplies hydraulic fluid from an accumulator (35) to wheel cylinders of disc brake units (21) of the respective wheels. Pressure-sustaining valves (53, 54) are placed in passages that extend from a first passage (45a) to the rear wheel cylinders. A pressure-increase response-delay reducing section closes the pressure-sustaining valves (53, 54) for a predetermined period of time after starting the hydraulic pressure control to temporarily limit the inflow of hydraulic fluid into the wheel cylinders that communicate with the first passage (45a). Thus, the amount of the hydraulic fluid that is supplied to the second passage (45b) is increased, and it is possible to reduce the hydraulic pressure response delay in the second passage (45b).