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BMW E61 Rear Air Suspension Bellow , OEM 37126765602 37126765603 Air Spring Bag Air Suspension Air Suspension is a type of automotive suspension that uses air springs instead of conventional steel springs. Computer-operated vents on the air springs, suspension sensors, and an onboard air compressor allow the system to maintain ride height and vary the suspension's ride characteristics. Air Spring An air spring is a rubber and fabric bladder that holds air pressure to support