See those little white dots,,,,those are on a X5 E70 right rear airbag,,,those are the leaks I found,
here a better picture,,,customer said the right rear suspension starts to sag when parked for a short time,,,,so I took some soap water and sprayed down the airbags,,,,sometime this works,,,,it’s a 50% chance that you find a leak,,,but I got lucky on this one,,,,I have also seen the airline to the airbag start to leak,,,also the valve on the air pump has leaked,,,,when that leaks the both rear airbags will lose air pressure.
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bmwtechnician 
Is it a similar setup in the rear of the 750Li?
No repair, just replace, right?
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Correct
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How do you diagnose the pump or lines. My RR airbag would leak and be low every time I fly out of town. So I replaced both airbags. Next trip it was low again. So guessing the airline is leaking? Suggestions?
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Ok,,,,you said when you fly out of town the rear airbags lose air,,,,,how many days are you gone,,,,do they lose air over night?,,,,,if the rear of the car is sagging over night you have a problem,,,,if it takes a couple of days I wouldn’t worry about it,,,,if both sides are sagging over night the chances of 2 airlines are leaking are very rare,,,,,so your problem might be at the air pump check valve area,,,,see if you can spray it with soapy water to find air leak
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is it possible to install aftermarket conversion shocks and springs on a bmwx5 to replace aiřbag shocks.and how costly is it?
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Yes anything can be done with the right amount of money,,,,you will have to install rear springs and the rear arms they sit on,,,,this is not going to be cheap,,,,why are we considering do that?
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