Patent ID: 6226993
Filing Date: 2001-05-08
Classification: B60T

Abstract:
A fully hydraulic brake booster/master cylinder unit for a vehicle brake system, witha housing and a bore which is formed therein and in which is arranged sealingly and displaceably a primary piston which is coupled to an input member for transmitting an actuating force to the primary piston,a first pressure chamber which is arranged in the bore and one boundary wall of which is formed by one end wall of the primary piston, anda first booster chamber which is arranged in the bore and one boundary wall of which is formed by the other end wall, located opposite the end wall, of the primary piston, with an inlet for hydraulic fluid under pressure in order to boost the actuating force,a second booster chamber arranged in the bore, wherein the brake booster/master cylinder unit is adapted to supply hydraulic fluid under pressure to either one of the first and second booster chambers independently of each other.