If the clutch bearing fails to meet the above requirements, it will be regarded as a failure. After a failure, we must first determine which phenomenon is the damage of the split bearing. When the engine starts to step on the clutch pedal, when the free stroke has just been eliminated, the "sand sand" or "squeaky" sound will continue to step on the clutch pedal. If the sound disappears, it is not the problem of separating the bearing. If there is still sound, it is the separation of the bearing.