| 摘要 |
In a disc brake assembly, one braking pad is associated operatively with a piston, which moves in a cylinder, and another braking pad is associated with a caliper, which is movable together with the cylinder. A first biasing means retracts the braking pads from opposite faces of a disc upon release of hydraulic pressure from a piston. A second biasing means retracts the caliper upon release of such pressure. A drag part, which grips a shaft frictionally, is able to move axially along the shaft, if the force being transmitted by the caliper upon application of such pressure exceeds the force required to energize the second biasing means, so as to compensate for wear of the second braking pad. A limiting means, which cooperates with the drag part so as to limit retraction of the caliper to a fixed distance. In a preferred form, the limiting means comprises a second drag part, which grips the shaft frictionally, which is shorter in its axial length than a given distance between opposite arms of the caliper, and which engages one arm of the caliper, upon retraction of the caliper, so as to limit retraction of the caliper to the fixed distance, which equals the given distance between the arms of the caliper less the axial length of the second drag part.
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