| 摘要 |
A vehicle hydraulic braking system is disclosed which includes a primary pressure source, a secondary pressure source which is actuated upon failure of the primary pressure source and which is operated by an electric motor, and a hydraulic brake booster which utilizes pressurized fluid from either of the pressure sources to provide a power assist to the vehicle operator when a brake application is effected. Normally, fluid is communicated from the primary pressure source to the booster, and from the booster to the vehicle's power steering gear to operate the latter. However, upon failure of the primary pressure source and subsequent actuation of the secondary pressure source, a valve which is responsive to actuation of the secondary pressure source diverts fluid from the power steering gear to the system reservoir, thereby conserving the entire fluid output of the secondary pressure source for operation of the brake booster alone.
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