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Charles200

E39 528i pneumatic spring failure

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The self leveling suspension in the touring is dropping rapidly (~5 minutes) while the car is switched off. Turning the car on it pumps itself up and holds during driving, but I dont want to risk driving in case of further damage.

The self leveling fault light has NOT come on, so I dont think the electrical system has faulted.

Does anyone know what part is most likely to have failed? Will it be the bag leaking, a broken valve in the system or something else?

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The "springs" are known to fail, as crud gets caught in them and wears holes etc. They aren't terribly cheap to replace, but they do last a long time.

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am i best to remove the airbag and pressure test it then, as this is the most likely fault of the bag deflating, not a leaking air reservoir or something? hopefully someone has had hands on experience with this.

this has been helpful however.

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Does one rear corner sag more than the other when parked on the flat?

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no. both sides are fine when engine first turned off, then the right rear visibly starts to drop after a minute or so, all the way down to the bumpstop

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