Patent ID: 6641233
Filing Date: 2003-11-04
Classification: B60T

Abstract:
A hydraulic brake apparatus for a vehicle comprising:a hydraulic pressure generator which generates a power pressure irrespective of operation of a brake pedal and outputs the power pressure; a regulation valve which regulates the power pressure outputted from the hydraulic pressure generator to a predetermined pressure corresponding to an operation force of the brake pedal and outputs the predetermined pressure; a master cylinder having a first master cylinder pressure chamber and an auxiliary pressure chamber which is connectable to an output side of the regulation valve, the master cylinder being operated by an auxiliary pressure in the auxiliary pressure chamber to generate a master cylinder pressure corresponding to the auxiliary pressure in the auxiliary pressure chamber; a first wheel brake cylinder connected to the master cylinder and operated by the master cylinder pressure to apply braking force to a wheel of the vehicle; a pressure passage connecting the output side of the regulation valve to the auxiliary pressure chamber; and a pressure modulation device disposed in the pressure passage to modulate the auxiliary pressure to a pressure less than the predetermined pressure outputted from the regulation valve.