1. You can drive at a low speed first, then brake hard. If you find that the car shakes badly and the human body feels uncomfortable, then there is a problem with the shock absorber.
2. Press down the bumper firmly and then release it. If the car has 2-3 jumps, it means that the shock absorber is working well.
3. Make the car stop after driving 10km on the road with poor road conditions. Touch the shock absorber shell by hand. If it is not hot enough, there is no resistance inside the shock absorber and the shock absorber is not working. 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.
4. Remove the shock absorber and stand it upright, and clamp the lower end connecting ring on the vise, and pull the shock-absorbing rod several times hard. 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.