Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2009X3 STANDARDREPAIR AND DIAGNOSISBODY & FRAMETOWING SYSTEMSTRAILERS - REPAIR10 LOADING PLATFORM86 10 ... TROUBLESHOOTING ON MULTI-TRAILER
2009 BMW X3 Standard
86 10 ... Troubleshooting On Multi-Trailer
2009 BMW X3 StandardSECTION 86 10 ... Troubleshooting On Multi-Trailer
MULTI-TRAILER TROUBLESHOOTING TABLE
| Fault | Cause | Remedy |
|---|---|---|
| Trailer already brakes when foot is taken off accelerator | Shock absorber of overrunning equipment faulty | Replace shock absorber of overrunning equipment |
| Reversing sluggish or not possible | Brake system adjusted too strongly | Adjust brake system |
|
NOTE:
When automatic reversing is activated, there is a residual braking torque caused by the design. This results
|
Brake shoes jammed | Free brake shoes, replace complete brake shoes with brake shoe carrier if necessary |
| in slightly heavier overrunning. | Cables overtensioned | Adjust brake system |
| Handbrake effect too weak | Faulty adjustment | Adjust brake system |
| - | Faulty spring force accumulator | Adjust spring force accumulator |
| - | Brake cables heavily contaminated, corroded or kinked | Free cables, replace if necessary |
| Wheel brakes overheating | Brake system incorrectly adjusted | Adjust brake system |
| - | Overrunning equipment is sluggish | Lubricate overrunning equipment |
| - | Brake cables heavily contaminated, corroded or kinked | Free cables, replace if necessary |
| - | Cables overtensioned | Adjust brake system |
| - | Wheel brakes contaminated | Clean wheel brakes |
| - | Reversing lever of overrunning equipment jammed | Remove reversing lever, clean and grease with conventional BMW lubricants |
| Braking effect too weak | Excessive play in brake system | Adjust brake system |
| - | Brake linings glazed, fouled by oil, damaged or worn | Replace complete brake shoes, clean brake drums, replace if necessary |
| - | Overrunning equipment is sluggish | Lubricate overrunning equipment |
| - | Brake cables heavily contaminated, corroded or kinked | Free cables, replace if necessary |
| Jolting braking or starting off | Excessive play in brake system | Adjust brake system |
| - | Shock absorber of overrunning equipment faulty | Replace shock absorber of overrunning equipment |
| - | Brake shoes jammed | Replace complete brake shoes with brake shoe carrier |
| Brakes squeal or rattle | Wheel brakes contaminated or worn | Clean wheel brakes, replace brake shoes and/or brake drums if necessary |
| - | Out-of-round or banging brake drum | Replace brake drums |
| - | Pad loose | Replace brake shoes |
| - | Wheel-bearing play excessive | Replace wheel bearings |
| Brakes pull to one side | Tire pressure incorrect | Correct tire pressure |
| - | Brake linings glazed, fouled by oil, damaged or worn | Replace complete brake shoes, clean brake drums, replace if necessary |
| - | Suspension shock absorber has no effect | Replace suspension shock absorber |
| Brake pads worn at angle | Wheel-bearing play excessive | Replace wheel bearings |
| - | Pads worn to less than minimum thickness | Replace brake shoes |
| Towing attachment fails to engage after connection | Internal attachment parts contaminated | Clean and lubricate attachment |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.