Air Suspension Bellows & Compressor
SeriousSuspension & ChassisThe air springs can develop hairline cracks, causing slow leaks. If ignored, the compressor burns out trying to compensate.
Most affected: Most UK models, especially 45e/50e and M Sport
Typical symptoms
- •Car sagging on one corner after being parked
- •Unusually loud compressor noise
- •Chassis restricted warning on the iDrive
What to inspect before you buy
- ✓Measure the gap between tyre and arch on all four corners after the car has sat
- ✓Cycle the ride height through all levels and check for speed and smooth transition