| 摘要 |
A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder having a master piston, a hydraulic booster for actuating the master cylinder in response to depression of a brake pedal and a plurality of wheel brake cylinders connected to the master cylinder for braking respective road wheels. The hydraulic booster is provided with a power piston which is larger in diameter than the master piston. The power piston transmits a force to the master piston through a closed chamber which is defined between the power piston and the master piston, when the hydraulic power pressure is supplied to the hydraulic booster in response to depression of the brake pedal. The closed chamber is filled with a brake fluid which is supplied from the reservoir. Thus, a small stroke of the power piston will suffice for operating the master piston at a predetermined stroke, so that the stroke of the brake pedal is reduced. Also, a braking force is ensured with the power piston mechanically connected to the master piston, when the hydraulic booster, for example, does not operate.
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