|  |  | Results of the tests | 
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation | 
|---|
|  | Having
carried out the road test during the  See table   S15  RUMOROSITA' in condizioni di marcia  , a whistling noise was noticed coming from
the back.Continue depending on the circumstances in which the noise occurs | End of diagnosis | The noise increases round bends | Replace the wheel bearing
on the side where the noise is loudest  Op.   4450C32 | 
| The noise increases round bends | Continue to Step  1 | 
| The noise increases round bends | Refit the elements correctly. If necessary, replace
the faulty components | 
| 1 | BRAKE DISC GUARD CHECK | All OK | Problems met | Operation | 
|---|
|  | With
the vehicle on the ground, get underneath it using a trolley and
visually inspect the clearance between the brake disc and the guard | Continue to Step 2 | No clearance between the guard
and the disc | Refit the elements correctly. If necessary, replace the
faulty components | 
| 2 | SHOCK ABSORBER STEM CHECK | All OK | Problems met | Operation | 
|---|
|  | Check
that the noise is not due to friction between the shock absorber
stem and the seal | End of diagnosis | There is friction | Lubricate the stem with a
layer of silicon grease. If the noise persists, replace the shock
absorber.  Op.   4420A30 |