| 摘要 |
<p>A control system for a spring-actuated, pressure-released vehicle parking brake. The system includes, in series, a source of fluid under pressure, manually operated actuator valve means, automatic pressure responsive control valve means, and a brake actuator mechanism. The components are intercommunicated by fluid communication means for selectively manually or automatically directing fluid under pressure from said source to and from said brake actuator mechanism for operation thereof. The actuator valve means includes a two position actuator spool which selectively permits or blocks fluid flow from said source to said control valve means. The control valve means includes a spring biased pressure responsive spool member which permits or prevents fluid drainage from the brake actuator for engagement or disengagement thereof.</p> |
