| 摘要 |
A hydraulically operated booster brake mechanism which operates in response to movement of the brake pedal to produce braking when hydraulic pressure or power is available to assist such braking and also in the absence of such pressure and in which the ratio of pedal travel required at the foot pedal to afford displacement of the piston in the brake producing master cylinder is at one value when hydraulic pressure is available to assist braking and at another value in the absence of hydraulic pressure when braking must be produced by physical effort of the operator.
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