We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black rubber rear air spring with metal mounting plates, E61 chassis fit

Unity

Unity 15-525600 Rear Air Spring E61 Chassis

SKU CH-AJ9V-PEVHX

Replacement rear air spring for BMW E61 chassis models with rear leveling suspension

  • Restores rear air suspension ride comfort on compatible BMW models
  • Fits E61 chassis vehicles with rear leveling suspension from 2004 to 2010
  • Covers 5 Series models including 525i 528i 530i 535i 545i 550i variants
  • Backed by Unity's 50 years of aftermarket suspension manufacturing experience
  • Designed for trouble-free installation and long-lasting reliability

Rear Air Spring for E61 Chassis

This rear air spring is designed for BMW E61 chassis models equipped with rear leveling suspension. It restores the factory air suspension system on compatible wagons from 2004 to 2010. The part replaces a worn or leaking original unit to bring back proper ride height and load-leveling function. It is a direct-fit replacement built to match OE specifications.

Restores Suspension Performance

Replacing a failed air spring eliminates sagging, uneven ride height and compressor over-cycling. The new unit holds pressure consistently, allowing the leveling system to maintain the correct rear stance under varying loads. Normal driving comfort and stability return without the harshness of a collapsed air bag. Installation follows the original mounting points for a straightforward repair.

Upgrade From Failed Factory Units

This spring is the correct repair when the original rear air bag has cracked, leaked or burst on an E61 wagon. The jump is worth it when the vehicle sits low at the rear, the compressor runs constantly or a suspension fault appears. It is not for models without rear leveling suspension or for front axle applications. Buyers needing a front air spring or a complete compressor kit will need different parts.

Highlights

  • Restores rear air suspension ride comfort on compatible BMW models
  • Fits E61 chassis vehicles with rear leveling suspension from 2004 to 2010
  • Covers 5 Series models including 525i 528i 530i 535i 545i 550i variants
  • Backed by Unity's 50 years of aftermarket suspension manufacturing experience
  • Designed for trouble-free installation and long-lasting reliability

Specifications

BrandUNITY

Questions about this item

How is the Unity 15-525600 rear air spring installed on an E61 chassis, and what step is often missed?

The air spring bolts to the factory mounting points on the E61 rear suspension. The step often missed is depressurising the air system and disconnecting the airline before removing the old unit, otherwise the compressor can run dry or the line can whip.

What maintenance or replacement will this rear air spring need later?

Inspect the rubber bellows for cracks or abrasion at each service interval. Replace the spring if the vehicle sits unevenly overnight or if the compressor runs excessively to maintain ride height.

What limit appears first on this rear air spring under sustained heavy loads?

The rubber bellows will reach its maximum safe extension before the metal end caps yield, causing the compressor to cycle continuously and the vehicle to sag at the rear.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.