| 摘要 |
A parking brake system is provided in which a parking brake state of a wheel brake is obtained by forward movement of a parking piston ( 44 ) slidably fitted into a casing ( 23 ) with the rear side of the parking piston ( 44 ) facing a parking control fluid pressure chamber ( 47 ), a lock piston ( 56 ) forming part of a lock mechanism ( 31 ) for mechanically locking the forwardly moved state of the parking piston ( 44 ) is slidably fitted into the casing ( 23 ) to the rear of the parking piston ( 44 ) and urged forward by a spring, an opening ( 112 ) provided in a portion of the casing ( 23 ) that the rear side of the lock piston ( 56 ) faces is closed by a detachable lid member ( 113 ), a tool connection part ( 115 ) is provided in a rear portion of the lock piston ( 56 ), and the tool connection part ( 115 ) enables a tool inserted through the opening ( 112 ) to be detachably connected to the tool connection part ( 115 ). This enables an automatic parking brake state to be obtained by a simple structure without consuming power, and the parking brake state to be released by a manual operation for maintenance or inspection.
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