What causes the shock absorber to have resistance when compressed but not rebound?
2 Answers
The reasons why the shock absorber has resistance when compressed but does not rebound are as follows: Since the rebound force of the shock absorber is provided by the shock-absorbing spring absorbing road vibrations and impacts, once the shock-absorbing spring is damaged, it will greatly affect the rebound force of the shock absorber. The following is a related introduction to shock absorbers: 1. Working principle: The working principle is that when the frame (or body) and axle vibrate and undergo relative movement, the piston inside the shock absorber moves up and down, and the oil in the shock absorber chamber repeatedly flows from one chamber to another through different pores. 2. Purpose: To accelerate the attenuation of frame and body vibrations and improve the driving smoothness (comfort) of the car, most car suspension systems are equipped with shock absorbers.
I've encountered a situation where the shock absorber has resistance when compressed but doesn't rebound. After checking around, I found it's usually because the hydraulic oil inside the shock absorber has leaked out. There's still damping but the spring assist is gone, so it can only be compressed and won't return on its own. This is quite common, especially when the car is cold in winter or with older vehicles that have been driven for a long time. I specifically asked a car-savvy friend about this, and he said to avoid carrying heavy loads regularly or frequently driving on rough roads to prevent premature shock absorber wear. If left unrepaired, the wheels may wobble, and the car body becomes unstable at high speeds, posing significant safety risks. It's recommended to quickly find a professional shop for testing - they can easily spot the problem by using tools to compress it, and then just replace the part. Remember not to skimp and buy cheap parts; matching the original factory parameters is the most reliable approach. Safety first.
