还有，前面的闸皮也得换。
通过理论计算确定贴闸皮油压的数值，以便统一认识、指导实践。
In order to unify knowing and benefit manufacture, we must calculate the figure of the oil pressure contacting brake.
他两分钟就能搞定，时间成本低，而且也就是一块闸皮的事儿，材料成本低，所以便宜。
He finished it only two minutes, cost a little time, and only a piece of brake lining, a little material, so it's cheap.
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