The comfort of a car's ride depends on a key component in the suspension system – the shock absorber. Double-acting telescopic shock absorbers are a common choice in modern cars, and their proper functioning is crucial for vehicle stability and the lifespan of other components. To ensure shock absorbers are in good condition, regular inspection and maintenance are necessary.

Inspection Methods:
First, drive the vehicle on a rough road and observe the temperature of the shock absorber casing. If it's not hot, it indicates no internal obstruction, and lubrication may be needed. If the casing is hot, it may be due to insufficient oil, and the oil level should be topped up.
Press down firmly on the bumper and check the number of vehicle vibrations. Under normal circumstances, there should be 2-3 bounces, indicating that the shock absorber is working correctly.
If there is strong vibration during emergency braking, there may be a problem with the shock absorbers.
By pulling and pushing the shock absorber rod, check if the resistance is stable. The rebound resistance should be greater than the compression resistance. If it is abnormal, it may be due to insufficient oil or damaged parts, requiring repair or replacement.

Common Problems and Solutions:
Check for oil leaks and damaged seals in the shock absorbers; replace the seals if necessary.
Conduct a comprehensive inspection of the shock absorber connectors and rubber bushings, and repair or replace damaged parts.
Shock absorber noise may be caused by collisions, rubber pad problems, or deformed dust covers; the cause needs to be identified and repaired.

Performance Testing and Post-Repair Verification:
Ensure that the shock absorbers are performance tested on a test bench or through practical experience. The resistance during extension and compression strokes should meet the manufacturer's specifications. Manually pull and push the shock absorber to feel the resistance changes and recovery, to determine if the shock absorber is working properly.

In summary, maintaining the health of automotive shock absorbers is crucial for a good driving experience. Regular inspection and timely repair are key steps in ensuring smooth vehicle operation.