汽车制动管路采用尼龙管后，管子不再需要成形工序。

When used as automotive air brake lines, no forming operation is needed anymore.

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公司目前的主要产品包括制动管，燃油管和调压真空管等。

The main products of BCQ include Brake tube, Fuel tube and Boosting vacuum tube, etc.

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通常的做法是从列车制动管的一端充气，观察另一端的变化。

This is normally done by charging the brake pipe fully from one end of the train and checking that it has charged at the other end.

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