Here's how to check if your shock absorbers are good or bad:
1. Make the car stop 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, 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 is hot, it means that the inside of the shock absorber is short of oil, and you should add enough oil; otherwise, it means that the shock absorber is invalid;
2. Press the bumper hard and then release it. If the car jumps 2 or 3 times, it means the shock absorber works well。
3. When the car is running slowly and brakes suddenly, if the car vibrates violently, it means that there is something wrong with the shock absorber。
4. Remove the shock absorber and stand it upright, and clamp the lower connecting ring on the vise, and pull and press the shock absorber several times. At this time, there should be stable resistance, and the resistance of pulling up and restoring should be greater than that of pressing down. If the resistance is unstable or there is no resistance, it may be that the shock absorber is short of oil inside or the valve parts are damaged, and the parts should be repaired or replaced.