Shock Absorbers, Checking On Shock Tester

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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.

Special tools and workshop equipment required

Maha Shock Absorber Tester VAS1990

Test Prerequisites

Temperature +10 through +40 °C (50 °F through 104 °F).
Driver in vehicle.
Tire pressure OK.
Drive vehicle straight onto center of wheel contact plates.
Front wheels in straight position.
Electromechanical parking brake loosened, foot brake not actuated.

Threshold

Shock absorber condition can only be judged as follows:

Sufficient damping effect

Insufficient damping effect

NOTE:

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 shock absorber action has weakened enough that a replacement is recommended.

Example

Fig 1: Damping Effect Measurement

Courtesy of AUDI OF AMERICA, LLC

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.

Explanation of weight and production relevant numbers (PR no.) PRODUCTION CONTROL NUMBER (PR NUMBER) EXPLANATION .