Drum brakes have more parts than disc brakes and harder to service, but they are less expensive to manufacture, and they easily incorporate an emergency brake mechanism.
鼓式制动比盘式制动的零件多，维护也更困难，但鼓式制动造价便宜，且易于与紧急制动机构配合。
The service and emergency brakes are powered by their own hydraulic pack .
维修停车和紧急刹车由他们自己的液压组件提供动力。
The engine has had a full service and the brakes are working well again.
发动机作了全面维修，而且刹车系统现在也运转得很好。
The engine has had a full service and the brakes are working well again.
发动机作了全面维修，而且刹车系统现在也运转得很好。
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