Patent ID: 8186772

Claim:
A vehicle brake apparatus comprising: a boosted hydraulic pressure chamber; a master cylinder comprising: a master piston of which back side faces the boosted hydraulic pressure chamber; and a casing accommodating the master piston in a slidable manner; a hydraulic pressure generating source; a reservoir; and a pressure regulating valve unit which regulates output hydraulic pressure of the hydraulic pressure generating source in response to an input of brake application effort from a brake operation member for application to the boosted hydraulic pressure chamber; wherein the master cylinder is connected to wheel brakes, the pressure regulating valve unit electrically controls to adjust the output hydraulic pressure of the hydraulic pressure generating source to apply the adjusted hydraulic pressure to the boosted hydraulic pressure chamber, a release valve is interposed between the boosted hydraulic chamber and the reservoir, and the release valve is a normally closed solenoid valve which releases the hydraulic pressure in the boosted hydraulic pressure chamber to the reservoir side when the pressure regulating valve unit fails.