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#1
05-17-2011, 12:49 AM
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9 times out of 10 it is the bags leaking down. They just get old and degrade enough to start leaking over the years.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#2
05-17-2011, 08:33 AM
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Same thing with mine. You will notice the leaks by lowering your car to the lowest level and then spraying something like windex which bubbles onto the air bags. At the lower setting the lower portion of the bag rolls back upwards against the shock and you will start to see some small cracks from the rubber drying out. When up raise the suspension it rolls back out and I am guessing these small cracks seal themselves as even after spraying the bags in the upper position I can't see a single leak! I suppose that the leaks are so small that at some point the bags loose enough volume that they need to be refilled hence the compressor turning on. The clunk noise stops when you "pump" some more air into the bag by setting up the system on the higher setting then lowering it back to the middle position. Apparently the actual replacement of the bags is fairly easy to mechanically inclined folks albeit they are pretty pricey.
I have to tackle the DS front one soon. I hate to see the car leaning. I hope this helps.
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____________ 2006 X5 4.8is Titanium Silver / Black (36K miles) Dinan Cold Air Intake, Software, Exhaust -- 1996 M3 Sedan Artic Silver / Dove Grey (65K miles) Dinan Stage III Super Charger, Software, Throttle Body Short springs on Koni Gas Adjustable Borla Exhaust
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#4
05-18-2011, 04:52 AM
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In my case, I drive a 2002 E53 3.0d. I replaced the rear driver side air bag. after 2 months the other side leaked. I suggest to all owners with rear self levelling suspension to replace both air bags same time to avoid the inconvenience of going back to the shop again...
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 2002 E53 X5 3.0d SAV
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