BMW E32 self-levelling suspension faults
E32 rear does not rise or is hard and clunks - what causes the self-levelling fault?
The most common causes are worn or discharged accumulators (pressure reservoirs), leaking rear shock absorbers and hydraulic leaks. If the rear end feels bouncy or knocks in sharp potholes, the gas in the accumulators or shocks has often leaked out. The repair is renewing or repairing the worn part.
Why does the E32 self-levelling not raise the rear even though no leak is visible?
The cause can be on the suction side of the pump. The inner surface of the pump suction hose can tear and block the hose without any external sign, so the power steering makes noise and the rear does not rise. The normal pressure of the circuit is 30-130 bar. Check the suction hose before more expensive parts.
How are leaks in the E32 hydraulic pump and pipes repaired?
The pump serves the brakes, the power steering and the self-levelling. Replacing the pump's seal kit is a simple job. Leaks are often at the banjo bolt connections rather than in the hoses themselves, so check the connections first. A broken pressure pipe can be replaced with brake pipe, and the fittings are made up at a workshop.