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86 10... Troubleshooting On Multi-Trailer

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 750i. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING CHART

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
NOTE: When automatic reversing is activated, there is a residual braking torque caused by the design. This results in slightly heavier overrunning.
Brake system adjusted too strongly Adjust brake system
Brake shoes jammed Free brake shoes, replace complete brake shoes with brake shoe carrier if necessary
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