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Black cylindrical rubber air spring with metal end caps and mounting hardware visible

Unity

Unity 15-529901 Rear Left Air Spring

SKU CH-4RE6-9K4Y1

Replaces rear left air spring on 2001-2004 Audi A6, A6 Quattro and 2001-2005 Allroad Quattro models

  • Restores air suspension performance with Unity Elite Suspension Line
  • 50 years of aftermarket manufacturing expertise behind every part
  • Direct-fit replacement for 2001-2004 Audi A6 models
  • Designed for trouble-free installation on Allroad Quattro 2001-2005
  • Rear left air spring built for long-lasting reliability

Compatible Models

This rear left air spring fits 2001-2004 Audi A6 and A6 Quattro models as well as the 2001-2005 Audi Allroad Quattro. It is designed for owners restoring the original air suspension system on these specific vehicles.

Replacing Worn Air Springs

The unit replaces a failed or leaking factory air spring to restore ride height and comfort. The upgrade is worth it when the existing suspension sags, triggers warning lights or no longer holds pressure after 50 years of potential wear.

Verify Fitment Before Ordering

Confirm the vehicle year, model and drive configuration match the listed application range exactly. Check that the suspension corner corresponds to the rear left position and that no aftermarket conversion kit has altered the original mounting points.

Highlights

  • Restores air suspension performance with Unity Elite Suspension Line
  • 50 years of aftermarket manufacturing expertise behind every part
  • Direct-fit replacement for 2001-2004 Audi A6 models
  • Designed for trouble-free installation on Allroad Quattro 2001-2005
  • Rear left air spring built for long-lasting reliability

Specifications

BrandUNITY

Questions about this item

Does the 15-529901 air spring mount directly to the rear left corner of a 2001-2004 Audi A6 Quattro?

Yes, this unit is built for the rear left position on 2001-2004 Audi A6, A6 Quattro and 2001-2005 Allroad Quattro models.

What is the common installation mistake when fitting this air spring on an Allroad Quattro?

Technicians often forget to depressurise the system and support the chassis before removing the old spring, which can damage the new unit during fitment.

How often should the rear left air spring on a 2004 Audi A6 be inspected for replacement?

Inspect the spring at every major service interval; plan on replacement once cracking, leaks or uneven ride height appear, typically after several years of use.

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