Front suspension noise (whistling/humming)
- Make
- Alfa Romeo
- Model
- Brera and Spider Factory Service Manual
- Year
- 2005–2010
- Section
- Noise / vibrations › Front suspension noise (whistling/humming)
FRONT SUSPENSION NOISE (WHISTLING/HUMMING)
Whilst driving, especially on unmade roads, there is a whistling noise coming from the front suspension. This diagnosis can only be made after
See table S015 NOISE WHILST DRIVING
Carry out the latter first.
If the problem is only on one side, carry out the checks and any operations on the appropriate side only.
| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Having carried out the road test, during the See table S015 NOISE WHILST DRIVING , there was a whistling noise from the front. Continue depending on the circumstances in which the noise occurs. | End of diagnosis | The noise increases when cornering. | Move on to Step 1. This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor. | |
| The noise increases in vertical oscillation conditions. | Move on to Step 2. | |||
| 1 | CHECKS ON THE WHEEL HUB | All OK | Problems encountered | Operation |
Visually inspect that the yield point type bolts fixing the bearing to the steering knuckle have not loosened. Also check for the presence of grease on the wheel hub. | Move on to Step 2 | Shear bolts loose. | Replace the bolts and restore the correct tightening. | |
| Presence of grease on the wheel hub. | Replace the wheel bearing complete with hub on the side where the noise is loudest Op. 4450C28 FRONT WHEEL HUB,LEFT OR RIGHT - R.R WITH WHEEL REMOVED, CHECK WHEEL GEOMETRY SEPARATELY This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor. | |||
| 2 | BRAKE DISC CHECK | All OK | Problems encountered | Operation |
Check for any distortion to the disc heat shield. Turn the wheel assembly to check for noise due to contact between disc and heat shield. | Move on to Step 3 | Heat shield deformed. | Restore the correct gap Op. 3310A57 FRONT BRAKE CALIPER BRACKET (ONE), LEFT OR RIGHT - R.R Replace the shield if necessary Op. 3310A57 FRONT BRAKE CALIPER BRACKET (ONE), LEFT OR RIGHT - R.R | |
| Contact between heat shield and disc. | Replace the brake disc. Op. 3310A48 FRONT BRAKE DISC (ONE), LEFT OR RIGHT - R.R if the noise persists, replace the wheel bearing with the hub Op. 4450C28 FRONT WHEEL HUB,LEFT OR RIGHT - R.R WITH WHEEL REMOVED, CHECK WHEEL GEOMETRY SEPARATELY | |||
| 3 | SHOCK ABSORBER STEM CHECK | All OK | Problems encountered | Operation |
Remove the left wheel Op. 4450B02 LEFT FRONT WHEEL - R.R and/or the right one Op. 4450B04 RIGHT FRONT WHEEL - R.R Check that the noise is not due to irregular friction between the shock absorber stem and the gasket, checking the condition (scoring/contact marks) of the stem chrome surface. | End of diagnosis | There is irregular friction | Lubricate the stem raising the dust cover with a layer of silicon grease. If the noise persists, replace the shock absorber | |
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