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Two rear air spring bags in a Unity kit for BMW wagons

Unity

Unity Rear Air Spring Kit 2-15-525501-15-525502

SKU CH-59PA-80T8V

Kit includes two rear air spring bags for 1999-2003 BMW 5 Series wagon models with self-leveling suspension

  • Restores smooth air ride with two suspension air spring bags
  • Fits 2001-2003 BMW 525i Wagon with self-leveling suspension
  • Fits 1999-2000 BMW 528i Wagon with self-leveling suspension
  • Fits 1999-2003 BMW 540i Wagon with self-leveling suspension
  • Backed by Unity's 50 years aftermarket suspension experience

Rear Air Spring Kit for BMW Wagons

This Unity rear air spring kit contains two replacement air spring bags designed for 1999-2003 BMW 525i, 528i and 540i wagon models equipped with self-leveling suspension. It restores the original air ride function for owners who need to replace worn or leaking rear springs.

Sustained Load Behaviour

The air springs maintain consistent ride height and damping under continuous vehicle weight and road inputs, supporting the self-leveling system through daily driving cycles. They are built to resist fatigue from repeated compression and extension over long service intervals.

Installation and Common Issues

The kit is engineered for a direct bolt-on fit to the factory mounting points on eligible wagon models, simplifying the replacement process. Installers should verify the vehicle has self-leveling suspension and not sport suspension, as the latter is excluded from fitment.

How it compares

Measured against everything we stock in Engine Parts, Chassis & Socket Sets, at today’s prices. Recalculated every night.

Price $122.99
Pricier than about 70% of the 231 comparable items (median $62.99).

Specifications

Product
Brand nameUNITY

Questions about this item

Does the Unity 2-15-525501-15-525502 rear air spring kit generate any noise or heat during continuous daily driving?

The air spring bags operate silently and produce no measurable heat, so all-day driving adds no cabin noise or thermal load.

What existing suspension components must my BMW wagon already have for this kit to install and function correctly?

The vehicle must be a 1999-2003 525i, 528i or 540i wagon equipped with the factory self-leveling suspension; sport suspension models are excluded.

Will the Unity 2-15-525501-15-525502 kit work alongside the original electronic damping control on my 2001 BMW 525i wagon?

Yes, the replacement air springs are designed for the OE self-leveling system and integrate with the existing electronic damping control without modification.

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