1. The car performs emergency braking on a safe road at a relatively reduced speed. Observe whether the braking posture of the car is very different from the previous feeling. If the vibration is too large, there is a problem with the shock absorber.
2. Oil leakage. The shock absorber can work normally, relying on the hydraulic oil inside. Once the oil leaks, the performance of the shock absorber will definitely decrease. If there is a lot of oil leakage, it will be completely broken, it will not work, and it must be replaced.
3. When the car is in a stopped state, when we press down and release a corner of the car body, the car body will rebound under the spring force. If it stabilizes soon after the rebound, the shock absorber is good. If it stops after repeated shaking several times, it means that the shock absorption effect of the shock absorber is a bit poor.
4. Abnormal noise. The abnormal noise of the car usually occurs when the road is not good. Because many parts of the chassis can produce noise, we have to make sure that it is the abnormal noise of the shock absorber before replacing it. There are other cars that make abnormal noises on the road when it is cold in winter. After the temperature is not so low, there will be no abnormal noise. In this case, the shock absorber does not need to be replaced.