第一环形表面至少部分地限定第一制动室。
The first annular surface defines, at least in part, a first brake chamber.
第二环形表面至少部分地限定第二制动室。
The second annular surface defines, at least in part, a second brake chamber.
引入第一制动室的第一流体沿第一方向推动制动销。
A first fluid introduced into the first brake chamber will urge the brake pin in a first direction.
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