| 摘要 |
The return of actuating fluid from a vehicle brake is diverted to a sump-connected bypass line and is prevented from returning through the brake control valve by a shuttle valve which is interposed in the brake line between the brake and the control valve. The shuttle valve shifts in response to the fluid pressure in the brake line to connect fluid pressure to the brakes and block the bypass line when the control valve is positioned for actuating the brake and to block the brake line and open the bypass line when the control valve is positioned for deactivating the brake.
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