31 90... Front axle troubleshooting
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2014 BMW X6, 2013 BMW X6, 2012 BMW X6, 2011 BMW X6, and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.
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 |
|
If necessary, replace STABILIZER LINK | |
| 3. Tension strut loose |
|
Tighten screw connections as specified in REPAIR INSTRUCTION | |
| 4. Tension strut faulty |
|
If necessary, replace TENSION STRUT | |
| 5. Lower control arm loose |
|
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 |
|
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 |
|
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 |
|
||
| -> 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.