1. Stop the car after driving 10km on a road with poor road conditions, and touch the shock absorber shell with your hands. If it is not hot enough, there is no resistance inside the shock absorber and the shock absorber does not work. At this time, you can add appropriate lubricating oil, and then test, if the shell heats up, there is a lack of oil inside the shock absorber, and enough oil should be added; otherwise, the shock absorber has failed.2. Press the bumper firmly and then release it. If the car jumps 2 or 3 times, it means that the shock absorber is working well.
3. When the car is driving slowly and braking urgently, if the car vibrates violently, it means there is a problem with the shock absorber.
4. Remove the shock absorber and stand it upright, and clamp the lower connecting ring on the vise, and pull the shock-absorbing rod several times. At this time, there should be a stable resistance, and the resistance of pulling upwards should be greater than when pressing downwards. If the resistance is unstable or no resistance, it may be due to lack of oil inside the shock absorber or damage to the valve parts. Repair or replacement parts should be carried out.