Patent ID: 6386647
Filing Date: 2002-05-14
Classification: B60T

Abstract:
A hydraulic brake apparatus for a vehicle comprising:wheel brake cylinders operatively mounted on wheels of said vehicle, respectively; a master cylinder for advancing a master piston in response to operation of a brake pedal to supply hydraulic braking pressure to said wheel brake cylinders; a power chamber formed behind said master piston; a reaction piston with the front end thereof exposed in said power chamber for transmitting a reaction force produced by the pressure in said power chamber to said brake pedal; a reservoir for storing brake fluid; a power source for pressurizing the brake fluid stored in said reservoir to supply power pressure to said power chamber; a return passage for connecting said power chamber to said reservoir to return the brake fluid thereto; valve means for opening and closing said return passage; detection means for detecting the amount of operation of said brake pedal; and control means for controlling said valve means to be opened and closed in response to the amount of operation of said brake pedal detected by said detection means to reduce the amount of the brake fluid in said power chamber.