| 摘要 |
A fail-safe mechanism has a piston, a first valve and a second valve which are opened/closed by the movement of the piston, a fluid pressure chamber, and a spring. The piston normally opens both the first valve and the second valve to make a master cylinder and a wheel cylinder communicate with each other, and make the wheel cylinder and a fluid chamber of a first fluid pressure control mechanism communicate with each other. At the time of anti-lock control, as the fluid pressure in the actuating circuit increases, the first valve is closed, and the brake fluid is fed back into the second fluid chamber of the first fluid pressure control mechanism only through the second valve. Further, when the fluid pressure in the actuating circuit decreases, the piston is moved to the fluid pressure chamber by the urging force of the spring to open the first valve and close the second valve so as to make the master cylinder and the wheel cylinder directly communicate with each other only through the first valve.
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