BMW F10 rear air spring bag leak
Why does the rear of a BMW F11 Touring sink when the car is parked?
The cause is usually a leaking air spring. The spring folds in a certain parking position over the hole and then leaks faster. Air is distributed to each spring separately, so a leaking spring lowers the rear only on its own side.
How is the rear air spring replaced?
The replacement can be done from underneath without removing the trim. The car is kept without power so that the compressor does not start in the middle of the job. 1. Remove the plastics at the rear so that the spring and the valve block are visible. 2. Release the pressure and remove the wheel. 3. Disconnect the air hose with a 10 mm flare nut wrench and the lower end of the spring. 4. Install the new spring. A nut and a split bushing are included. The job takes about 30-40 min.
Why is the rear hard after replacing the air springs?
The car may be in transport mode, which shows up as fault code 23800. The mode is removed with a diagnostic tool, after which the rear works normally. The function depends on the software version.