| 摘要 |
A pair of front wheels are diagonally connected with a pair of rear wheels. A first fluid pressure control valve device is arranged between a first fluid pressure generating chamber of a tandem master cylinder and the wheel cylinder of one of the front wheels; a second fluid pressure control valve device is arranged between a second fluid pressure generating chamber of the tandem master cylinder and the wheel cylinder of the other of the front wheels. A valve apparatus, arranged between the wheel cylinders of the front wheels and the wheel cylinders of the rear wheels, supplies a fluid pressure to the rear wheels in accordance with the lower one of the brake fluid pressures of the front wheels as controlled by the fluid pressure control valve devices. The valve apparatus includes a pair of valve parts, and a piston or piston group, including a pair of fluid pressure receiving portions or piston members. When one of the two conduit systems fails, at least one of the valve parts belonging to the other functioning conduit system is maintained in the open state.
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