Patent ID: 7104612

Claim:
A brake hydraulic pressure generator comprising a booster, an input element including an input shaft adapted to operate under an operating force applied to a brake operating member, a stroke simulator for imparting a stroke and a reaction force corresponding to an operating amount applied to the brake operating member to said input shaft, and a control valve for adjusting an output of said booster so as to correspond to the operating amount applied to the brake operating member, an output element for receiving the output of said booster, thereby producing an output, said output element being axially movable relative to said input element, a master cylinder including a master piston cylinder slidable therein for defining a pressure chamber for receiving the output of said output element, thereby producing brake hydraulic pressure in said pressure chamber, a pressure detector member being separate from both the input shaft and the stroke simulator and being slidably disposed in the master cylinder piston for sliding movement along an axis relative to the input shaft and the stroke simulator, the pressure detector member having one end thereof directly exposed to said pressure chamber for receiving an output hydraulic pressure of said master cylinder and applying to said control valve a reaction force corresponding to a force applied to said pressure detector member from said master cylinder, wherein said control valve separately receives an input transmitted from the brake operating member through said stroke simulator and said input shaft and the reaction force from said pressure detector member from opposite directions to each other such that said input balances with said reaction force from said pressure detector member.