drop brake

例句：

1. 1.The car's drop brake is working properly.
   汽车的刹车装置工作正常。
2. 2. The driver quickly applied the emergency drop brake.
   司机迅速应用了紧急制动器。
3. 3. The train was stopped by a sudden drop brake.
   火车因突然的刹车而停止。