Clutch master cylinder, slave cylinder, equivalent to two hydraulic cylinders. There is an inlet and outlet oil pipe on the master cylinder and only one pipe on the slave cylinder. When the clutch is pressed, the pressure of the master cylinder is transmitted to the slave cylinder. The slave cylinder works, and the clutch pressure plate and plate are separated from the flywheel by the release fork. At this time, the gear shift can be started. When the clutch is released, the slave cylinder stops working, the clutch pressure plate and plate contact with the flywheel, the power transmission continues, and the oil of the slave cylinder flows back into the oil pot. When the shift is difficult and the separation is not complete, it is necessary to detect whether there is oil leakage in the clutch master cylinder and slave cylinder, and solve the problem in time to reduce the wear.