| 摘要 |
A direct apply brake system includes a control valve which when actuated applies fluid from a central hydraulic source directly to a wheel brake. A master cylinder is mounted in tandem with the direct apply brake control valve and actuated upon over-travel of the valve subsequent to loss of reaction pressure acting on the valve, thereby providing a back-up pressure source. Shuttle valves associated with the wheel brakes selectively connect the brakes to the brake control valve or the master cylinder, whichever is in operation. A shut-off valve blocks communication of the central hydraulic fluid to the brake control valve when the master cylinder is actuated to prevent loss of such fluid in the event of a fluid leak in the direct apply system.
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