After carrying out a road test during diagnosis, a noise is heard from the rear identifiable as knocking.

See table S015 NOISE WHILST DRIVING

Continue depending on the circumstances in which the noise occurs

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 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

Position the vehicle on a two column lift and raise it.

Check that the handbrake cables or outer casing do not knock against the fuel tank, heat shields or bodywork during oscillations.

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

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 taking care to fit it correctly

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

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

Starting from the area where the knocking was identified, check the tightening torques for the following bolts:

- securing the axle bracket to the bodyshell;

- securing the bush to the axle bracket;

- lower shock absorber fastening;

- fastening the shock absorber mounting to the bodyshell;

- fastening the rear brake caliper to the stub axle

See Test 4420OB CHECKS ON CORRECT TIGHTENINGS FOR REAR SUSPENSION

The knocking is caused by another system (e.g. the fuel float in the tank).

Carry out the appropriate checks to identify the cause of the noise