Shock Absorbers, Checking On Shock Tester
Special tools and workshop equipment required
- Maha Shock Absorber Tester: VAS1990S
- Suspension Strut Test Bed: VAS6636
- Suspension Strut Test Bed: VAS6640
Shock absorbers can be checked while installed using the shock tester (shock absorber testing device). The damping effect can be evaluated based on the dial reading or print-out.
Test Requirements
- Temperature +10 to 40 °C (+50 to 104 °F)
- Driver in vehicle.
- Tire pressure OK
- Drive vehicle straight onto center of wheel contact plates.
- Front wheels in straight position.
- Parking brake not engaged, foot brake not pressed.
Threshold
Shock absorber condition can only be judged as follows:
- Sufficient damping effect
or
- Insufficient damping effect
Shock absorber test for vehicles with regulated suspension (Audi magnetic ride). Refer to Technical Service Handbook (HST).
Intermediate values for reduced damping performance cannot be read out.
A prognosis on service life is not permitted.
Measured values that occur with the involvement of the suspension travel end stops are incorrect.
The following values apply only to the test stands named above. If the specified values are exceeded, the effect of the shock absorber has weakened enough that a replacement is recommended.
Example
Threshold = 70
- a = greater than 70: insufficient damping effect
- a = less than 70: sufficient damping effect
The shock absorber combination installed in the vehicle is indicated by the corresponding PR number on the vehicle data plate.
Production Control Number (PR number) explanation. Refer to PRODUCTION CONTROL NUMBER (PR NUMBER) EXPLANATIONS .