The shock absorber can be checked manually.
Remove shock absorber.
Hold the shock absorber in the installation position, stretch and compress the shock absorber.
Throughout the entire travel, the rod must move with uniform force and without jerks.
A defective shock absorber is recognized during the ride by bumps and cracks. However, these noises often have other causes, such as loose bolts, nuts, defective wheel bearings, constant velocity joints. Therefore, before replacing the shock absorber, it should be checked, maybe even at the stand.
In normal operation, small traces of oil are not a reason for replacement. A rough estimate is as follows: if the oil slick is visible and not within range of the upper lock of the shock absorber (shock absorber oil seal) to the lower spring cup, then the shock absorber is considered normal. In this case, an additional condition is that. that the stain should not be glossy, dull or covered with dust. Small oil streaks are even an advantage, as this lubricates the oil seal and thus extends the service life.
With a large loss of oil, the shock absorber is replaced.
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