| 摘要 |
<p>A disc brake assembly includes a caliper movable relative to a rotor for the purpose of urging a pair of friction elements into engagement with the rotor. A housing of the caliper defines a stepped bore for receiving a piston which cooperates with the housing to form a pressure chamber within the stepped bore. A plate within the pressure chamber separate the pressure chamber into a pair of cavities and a valve assembly controls communication of fluid pressure to one of the pair of cavities and to the other cavity. During initial fluid pressure build-up in the caliper, the valve assembly remains in a first position to communicate fluid pressure to one of the cavities so that the plate and piston advance to a braking position at a first rate of speed. After the initial fluid pressure build-up when the fluid pressure reaches a predetermined value, the valve assembly is movable to a second position to communicate fluid pressure to the other cavity so that the piston is advanced at a second rate of speed less than the first rate of speed.</p> |
