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3 Shock Absorber, Checking
⇒ “3.1 Shock Absorbers, Leaking”, page 7
⇒ “3.2 Shock Absorber Noises”, page 7
⇒ “3.3 Shock Absorbers, Checking when Removed”, page 7
⇒ “3.4 Shock Absorbers, Checking on Shock Tester”, page 8
3.1 Shock Absorbers, Leaking
Shock absorbers are frequently rejected and exchanged because
of leaks. Examinations on the test stand and on the vehicle have
shown that the replacement of a large number of rejected shock
absorbers was not justified.
Slight leaking of oil (“sweating”) at piston rod seal is no reason to
replace a shock absorber. A shock absorber damp with oil is OK
under the following circumstances:
♦ Oil leak (shown screened in illustration) is visible, but dull,
matte and possibly dry from dust.
♦ Oil excretion extends from upper shock absorber connection
(piston rod oil seal) no further than lower spring plate -arrow-.
Note
Minor oil excretion is advantageous since piston rod oil seal gets
lubricated, which increases service life. This applies to shock ab‐
sorbers on front and rear axles.
3.2 Shock Absorber Noises
Shock absorbers are frequently rejected and exchanged because
of rumbling noises. Examinations on the test stand and vehicle
have shown that there was not complaint with approximately 70%
of the rejected shock absorbers and the replacement was not
justified.
With complaints that are interpreted as rumbling or knocking
sounds, proceed as follows.
– Determine on a road test with the customer - if possible on a
dry stretch of road with irregularities - where, when and how
these sounds change.
Note
Only in the rarest of cases shock absorbers are the fault for
noises.
3.3 Shock Absorbers, Checking when Re‐
moved
Defective shock absorbers are noticeable when driving due to
loud rumbling noises - a result of wheel hopping - especially on
Audi Q7 2007 ➤
Suspension, Wheels, Steering - Edition 01.2014
3. Shock Absorber, Checking 7
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