Sagging the air suspension - BMW X5 & X6

           

If there is loss of suspension height in spite of a properly working air compressor the area to investigate is the rear air bellows

Air leakage related suspension sagging generally is seen when the car is parked overnight and sometimes even over a period of days.

Air springs are known to wear out and crack at the rubber bellow surface gradually after accumulating mileage.

They general service life of this part is 70K to 80K miles depending on usage

If you are looking for a cost effective repair Inter Cars offers a replacement in their high quality Magnum Suspension Components brand