| 摘要 |
A rotary master cylinder means including a housing having a cylindrical bore, a rotary piston rotatably mounted in the cylindrical bore and having a peripheral recess, a dam means slidably supported by the housing and radially inserted into the recess so as to define a pressure chamber in the recess, wherein the rate of delivery of brake fluid from the pressure chamber relative to rotation of the rotary piston effected by stepping on the brake pedal can be non-linearly varied by varying radial depth of the recess in accordance with its angular position.
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