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Rear Left Air Spring Air Suspension Bellow For BMW E53 OEM 37121095579 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 a load