Patent ID: 8231181
Filing Date: 2012-07-31
Classification: B60T

Abstract:
1. A brake system comprising: a master cylinder which generates brake-fluid pressure in response to a braking operation of a driver; an electrically-driven hydraulic pressure generator which communicates with the master cylinder, includes a rear fluid chamber and a front fluid chamber, and generates, based on the driver's braking operation, brake-fluid pressure when driven by an electrically-controllable actuator; and a plurality of wheel cylinders which communicate with the rear fluid chamber and the front fluid chamber, respectively, and which generate a braking force to brake wheels, wherein when the electrically-driven hydraulic pressure generator fails, brake-fluid pressure generated by the master cylinder is used to actuate the wheel cylinders, and wherein the hydraulic pressure generator includes: wherein the electrically-driven hydraulic pressure generator causes the wheel cylinders to generate the braking force when the rear piston and the front piston are moved forward past the rear inlet port and the front inlet port, respectively; and wherein the front supply port is formed between the second front cup seal and the first front cup seal.