Patent ID: 7413264
Filing Date: 2008-08-19
Classification: B60T

Abstract:
1. A vehicle braking system comprising: a master cylinder in which a master piston with its back turned to a boosted hydraulic pressure chamber is slidably housed in a casing; a hydraulic booster which has a control piston for achieving a balance between reaction force generated by hydraulic pressure of the boosted hydraulic pressure chamber and brake operating input from a brake operating member, and which applies output hydraulic pressure of a hydraulic power source to the boosted hydraulic pressure chamber after regulating the output hydraulic pressure as the control piston moves axially; and a brake stroke simulator installed between the brake operating member and the control piston in order for a driver to feel operating strokes of the brake operating member, the master cylinder being connected to wheel brakes, wherein the hydraulic booster includes a backup piston which is slidably housed in the casing with its front face turned to the boosted hydraulic pressure chamber and which can directly push the master piston in response to operation of the brake operating member when the hydraulic pressure of the boosted hydraulic pressure chamber decreases, wherein the brake stroke simulator is contained in the control piston and the control piston is completely contained in the backup piston.