Patent ID: 6604795
Filing Date: 2003-08-12
Classification: B60T

Abstract:
A braking system comprising:a hydraulically operated brake cylinder for operating a brake; a master cylinder operable according to an operation of a manually operable brake operating member, to pressurize a working fluid; a master-cylinder cut-off valve connected to the master cylinder: a high-pressure source disposed between the master-cylinder cut-off valve and the brake cylinder and operable according to the operation of the brake operating member, to pressurize the fluid, characterized by further comprising, said high-pressure source comprising a power-operated drive device, and a pressure-control cylinder having a control piston which is operable by said power-operated drive device and which partially defines a front control-pressure chamber and a rear pressure chamber on respective front and rear sides thereof, said front control-pressure chamber being connected to said brake cylinder while said rear pressure chamber being held in communication with said master cylinder; and a braking-pressure control device operable to control said power-operated drive device, to thereby control the pressure of the fluid in said brake cylinder.