31 90... Front axle troubleshooting
Follow troubleshooting for steering/shock absorbers. See 31 90... TROUBLESHOOTING SHOCK ABSORBER and 32 90... TROUBLESHOOTING ON STEERING
TROUBLESHOOTING CHART
| In event of edged road irregularity *On vehicles with ARS work through TROUBLESHOOTING FOR ARS FIRST |
Cause (observe sequence) | Check (if OK, then next cause) | Measure (during preliminary check only) |
| Rattling/banging
NOTE:
From 10 km/h and at approx. 20 mm height
|
1. Stabilizer link loose | 1. Check screw connection (see INSPECTION SHEET ) | Tighten screw connections as specified in REPAIR INSTRUCTION |
| 2. Stabilizer link faulty |
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If necessary, replace STABILIZER LINK | |
| 3. Tension strut loose |
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Tighten screw connections as specified in REPAIR INSTRUCTION | |
| 4. Tension strut faulty |
|
If necessary, replace TENSION STRUT | |
| 5. Lower control arm loose |
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Tighten screw connections as specified in REPAIR INSTRUCTION | |
| 6. Lower control arm ball joint faulty |
|
If necessary, replace lower CONTROL ARM | |
| 7. Upper control arm loose |
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Tighten screw connection as specified. See 31 12 002 REMOVING AND INSTALLING/REPLACING TOP LEFT CONTROL ARM and 31 12 003 REMOVING AND INSTALLING/REPLACING TOP RIGHT CONTROL ARM . | |
| 8. Upper control arm faulty |
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If necessary, replace upper control arm. See 31 12 002 REMOVING AND INSTALLING/REPLACING TOP LEFT CONTROL ARM and 31 12 003 REMOVING AND INSTALLING/REPLACING TOP RIGHT CONTROL ARM . | |
| -> If noise can still be heard, check other cause | |||
| In event of road irregularities and steering maneuvers | Cause (observe sequence) | Check (if OK, then next cause) | Measure (during preliminary check only) |
| Cracking/clicking |
|
|
Tighten screw connection as specified in REPAIR INSTRUCTION |
| 2. Front axle carrier/front axle truck twisted |
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||
| -> If noises can still be heard, check other causes | |||
TROUBLESHOOTING CHART
| In event of straightahead driving and cornering | Cause (observe sequence) | Check (if OK, then next cause) | Measure (during preliminary check only) |
| Grinding noise | Wheel bearing worn, dirty | Replace faulty WHEEL BEARING | |
| -> If noise can still be heard, check other causes | |||
TROUBLESHOOTING CHART
| In event of repeated impulse braking or road irregularities | Cause (observe sequence) | Check (if OK, then next cause) | Measure (during preliminary check only) |
| Muffled bang |
|
Check whether hydromount is leaking, for presence of cracks or rubber break-outs | If necessary, replace TENSION STRUT |
| -> If noise can still be heard, check other causes | |||
TROUBLESHOOTING CHART
| Cause (observe sequence) | Check (if OK, then next cause) | Measure (during preliminary check only) | |
| No conspicuous noise |
|
Check rubber mounts for cracks and rubber breakouts | If necessary, replace upper control arm. See 31 12 002 REMOVING AND INSTALLING/REPLACING TOP LEFT CONTROL ARM and 31 12 003 REMOVING AND INSTALLING/REPLACING TOP RIGHT CONTROL ARM . |
| 2. Lower control arm rubber mount (on spring strut bracket) faulty | Check rubber mounts for cracks and rubber break-outs | If necessary, replace lower CONTROL ARM | |
| Steering wheel inclination/steering backlash | Refer to BMW diagnosis system "Troubleshooting tree wheel/chassis alignment check" | ||
| -> If noise can still be heard, check other causes | |||
NOTE:
The tension strut rubber mount has an overload stop, which can cause knocking noises at high loads.