| 摘要 |
A hydraulic brake booster includes a housing that defines a pressure chamber. A piston slidably mounted in a housing bore is responsive to increasing pressures in the pressure chamber to move relative to the housing to actuate a braking mechanism, such as a master cylinder. The piston carries a sealing ring to slidingly seal the piston to the housing bore and a shield to protect the surface of the housing bore from atmospheric contaminates during long periods, when the hydraulic booster is in a brake-release position. The shield releasably connects to the piston and telescopes into a piston cavity for compact assembly with the piston.
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