1. Remove the shock absorber and stand it upright, and clamp the lower end connecting ring on the vise, and then forcefully pull the damping rod several times. At this time, there should be 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.
2. We can press down on the bumper of the car by hand and observe the car. If the car bounces two or three times, it means that the shock absorber is working well. If there is no bounce, it means that the shock absorber is not working.
3. If you brake suddenly when driving at a low speed, but find that the vibration is strong, it means that the shock absorber is broken.
4. Make the car stop after driving 10km on the road with poor road conditions and touch the shock absorber shell with your hands. If it is not hot enough, it means that 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 carry out the test. If the shell heats up, the shock absorber is short of oil, and enough oil should be added; otherwise, the shock absorber has failed.