| 摘要 |
Disclosed is a BBW brake device, wherein if a slave cylinder (42) is unable to operate, master cut valves (32, 33) open and brake fluid fills a reservoir (53) of a hydraulic modulator (23) when a master cylinder (11) initially operates. A hydraulic pump (55) is driven with the master cut valves (32, 33) closed, applying pressure to the brake fluid filling the reservoir (53), thereby activating wheel cylinders (26, 27; 30, 31). Since the amount of brake fluid on the downstream side of the master cut valves (32, 33) can be increased by filling the reservoir (53), by driving the hydraulic pump (55) to apply pressure to the brake fluid in the reservoir (53), it is possible to use the hydraulic modulator to generate a higher brake fluid pressure than the brake fluid pressure generated by the master cylinder, thus enabling an adequate braking force to be generated without increasing the force required to depress a brake pedal (12). |
