Having carried out the road test

See table S015 NOISE WHILST DRIVING

a knocking noise is noticed at the back.Continue depending on the situation when the noise appears.

1. The noise disappears when the handbrake is operated

2. The noise is also present in other conditions.

1. Eliminate the handbrake lever and/or actual handbrake clearance

2. Move on to Step 1

Raise the vehicle on a two column lift and check that there are no oil leaks from the shock absorber stem.

Slight dampness on the stem is considered normal because there is evaporation during the operation of the shock absorber.

If there is a persistent oil leak on the shock absorber stem, make sure that it is not coming from other parts of the vehicle that are lubricated

1. Leaks from other parts that are lubricated.

2. Leaks from the shock absorber stem.

1. Search for the cause of the leak following the appropriate diagnostic procedure

2. Replace the shock absorber

Op. 4420A30 REAR SUSPENSION SHOCK ABSORBER (ONE), LEFT OR RIGHT - R.R. - CHECK WHEEL GEOMETRY SEPARATELY

Check that there are no signs of interference between the suspension elements or between the latter and the bodyshell.

In particular, check that there are no signs of wear on the suspension springs and that they do not show signs of abrasion.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation.

1. Inteference due to incorrect fitting.

2. Abrasions or non conformity of the spring.

1. Eliminate the interference and restore the correct fastening. If this is not possible, replace the defective components.

2. Replace the spring

Op. 4420A48 REAR SUSPENSION COIL SPRINGS - R.R.

taking care to fit it correctly

Locate the area of the possible noise source: top or bottom.

Starting from the area where the knocking was identified, check the tightening torques

See Test 4420OB CHECKS ON CORRECT TIGHTENINGS FOR REAR SUSPENSION

of the bolts fixing:

- the axle brackets to the bodyshell;

- the torsion beam bushes to the axle mounting brackets;

- the lower shock absorber eyelet;

- the upper shock absorber mounting;

- the rear brake caliper to the stub axle.