| 摘要 |
A master cylinder is disclosed which is switched from a normal operating mode to a secondary mode when available vacuum is insufficient to operate the booster or at booster run-out. In these circumstances where the normal power assist from the booster is not available, the effective area of the input plunger of the master cylinder is reduced to reduce the manual actuating force required to generate braking pressure, thereby enabling the vehicle operator to more easily generate braking pressure.
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