The timing of replacing shock absorbers is not fixed, but requires a comprehensive judgment based on the vehicle's usage, driving conditions, and the performance of shock absorber failures. It is recommended that car owners regularly check the working status of the shock absorbers and replace them in a timely manner when necessary to ensure driving safety and comfort. Below is a specific analysis of when shock absorbers should be replaced.

1. Mileage and time traveled
The frequency of replacing shock absorbers is usually related to the usage of the car. According to search results, the replacement cycle for car shock absorbers is generally every 4 years or 80000 kilometers. This is because shock absorbers will gradually wear out and lose their original damping effect after prolonged or long-distance use. However, the specific replacement cycle may vary depending on factors such as vehicle type, road conditions, and personal driving habits.

2. Vehicle condition and driving conditions
The timing of replacing shock absorbers also depends on the vehicle's usage and driving conditions. If the vehicle frequently drives on poor road conditions, the wear of the shock absorber will be faster. Car owners should replace the shock absorber in advance to avoid driving safety issues. In addition, if uneven signs of tire wear are found, or if the car suspension is in contact to the bottom, it may also indicate that the shock absorber needs to be replaced.

3. Shock absorber malfunction performance
When the shock absorber malfunctions, there will be some obvious symptoms. For example, if oil leakage is found in the shock absorber, it indicates that the shock absorber has malfunctioned and should be replaced or repaired immediately. In addition, the working status of the shock absorber can be checked through some simple tests, such as forcefully pressing and releasing the bumper. If the car jumps 2-3 times, it indicates that the shock absorber is working well. When the car is driving slowly and braking urgently, if the vibration is severe, it may also indicate that there is a problem with the shock absorber.

4. Regular inspections
In addition to judging whether to replace the shock absorber based on the above performance, regular inspections should also be carried out. Generally speaking, after driving about 100000 kilometers, the shock absorbers should be inspected accordingly. This can promptly identify potential issues and replace them if necessary to ensure the safety and handling of the vehicle.