Many motorists have heard about the oldest, truly "old-fashioned" way of checking the degree of deterioration of car shock absorbers by swinging. Its essence is extremely simple: we swing the car body and release it, if it does not stop for the third roll, then there are problems with the shock absorbers and they need to be repaired or replaced. The problem is that with this method everything is not so smooth. But there is another, much more effective.
The key problem with the swing method is that it didn't work very well 20-25 years ago. Moreover, from the very beginning this technique was not suitable for all car models, both imported and domestic. Today it is better not to use this method at all, since nothing worthwhile can be learned with its help. The shock absorbers, like the entire suspension system, are not at all the same.
Nowadays, a different technique should be used to test the shock absorbers of a car. To begin with, the car is put on a jack. There is no need to crawl under the car. After lifting the car, open the hood, having previously armed with a suitable hex wrench. In the engine compartment, you need to find the shock absorber rod nut. She is what interests us.
The mentioned nut is unscrewed, as a result of which the shock absorber rod should be free, after which it should begin to move easily up and down. It is worth noting that during the operation the metal could sour a little, therefore (perhaps) at the beginning of the check, you will have to make certain physical efforts. As soon as the movement of the rod becomes free, it is necessary to slightly push the part down and release.
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So, if the rod falls deeper under its own weight, then the shock absorbers are tired and it's time to change them. If it tends upward or just stays in place, then everything is in order with the shock absorbers. This checks the front shock absorbers. The "hot" phase of the check is completely relevant for the rear ones, but it will be much more difficult to get to their stem.
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A source: https://novate.ru/blogs/180620/54957/