Symptoms include bounciness and/or knocking when driving over bumps. The vehicle may feel less stable and smooth than before. You may notice that your car continues bouncing up and down after driving over a pothole. Front strut Front strut. To pinpoint a weak or failed strut or shock absorber, your mechanic may do a quick "bounce test" where each corner of the vehicle is pushed down and quickly released. The corner with the weak shock absorber or strut will keep bouncing up and down longer, while the corner with the good unit will rebound slowly and will not bounce more than twice.
Another common reason to replace struts is after hitting a major pothole, curb or after an accident. In any of these cases, the strut might be bent, which may not be visible, but can be detected during the wheel alignment. Driving with a failed strut or shock absorber is not safe. In addition, if one shock or strut is not working, there is more load on the other three, which will cause them to fail sooner.
Do you have to replace both shock absorbers or struts if only one is bad? It's not necessary, but it's usually recommended to replace them in pairs, for example, both front struts or both rear shocks. Rear Shock Absorber Rear shock absorber. This is because a new shock absorber will absorb road bumps better than the old one. If you replace only one shock absorber, it may create "unevenness" from side to side when driving over bumps. However, if your car is not very old, replacing only one strut or shock absorber may be enough, since the opposite side is not worn out yet.