Patent ID: 9199621
Filing Date: 2015-12-01
Classification: B60T

Abstract:
1. A vehicle brake device in which master piston is driven by any one of a force corresponding to an operation force of a brake operation member and a force corresponding to a servo pressure in a servo chamber to generate a master cylinder pressure, the device comprising: a pressure accumulation portion that accumulates the brake fluid under pressure; a servo pressure generation portion that is configured to be able to generate the servo pressure using the brake fluid in the pressure accumulation portion regardless of the operation of the brake operation member; brake fluid consumption correlative value detection means for detecting a brake fluid consumption correlative value which always correlates with a consumption of the brake fluid in the pressure accumulation portion; and failure detection means for driving the master piston only by the servo pressure using the servo pressure generation portion in a state where the brake operation member is not operated, and detecting a failure of a master system caused by brake fluid leakage from the master system, based on a brake fluid consumption correlative value detected by the brake fluid consumption correlative value detection means at that time.