A spring holds the other ends in contact with the piston of a hydraulic cylinder. 另一端由一個(gè)彈簧托住，與液壓缸的活塞相接。
In front brakes it is usual to hydraulic cylinders in order to equallise the pressures exerted by the shoes. 在前制動(dòng)器中，通常使用兩個(gè)液壓缸，用以平衡制動(dòng)蹄所產(chǎn)生的壓力。
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