Replacing Air Bellows

Information 

• Air springs (air bellows) can be replaced individually.
• For vehicles that have been moved with leaks in the air spring system or have been driven to the workshop without air, we recommend that you replace the air bellows in pairs.

Information 

If you intend to re-use the VOSS threaded joint fitted on the vehicle, the VOSS threaded joint (including stopper and cutting ring) that comes pre-fitted on the new air spring must first be removed.

If the rear air bellows is replaced, you can choose between two possible procedures. The choice of procedure depends on the condition of the VOSS threaded joint (air line connection to air bellows) fitted on the vehicle:

• Option A:  Use the same VOSS threaded joint on the vehicle.
• Option B:  Replace VOSS threaded joint on the vehicle.

Option A: Using the same VOSS threaded joint on the vehicle: 

1. Unscrew VOSS threaded joint -2-  with stopper -1-  on the new air bellows.

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   As-delivered condition of air bellows (shown as an example)

2. If the cutting ring -1-  is not positioned on the stopper, remove cutting ring -1-  from the new air bellows.

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   Cutting ring (shown as an example)

3. Install new rear air bellows (see information on "Installing rear air bellows").

Option B: Replacing VOSS threaded joint on the vehicle: 

1. Loosen the cutting ring -1-  on the air line -3-  using a suitable tool.
2. Pull VOSS threaded joint -2-  off the air line -3-  .

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   Cutting ring and VOSS threaded joint

   Information 

   Sharp edges at the end of the air line or at the point where the cutting ring is fitted can damage the newly fitted O-ring.

   For this reason, always de-burr the end of the air line.

   If there is also a sharp edge at the point where the cutting ring is fitted, the air line must be repaired.

   > 438541 REPAIRING AIR LINE 

3. Check air line for damage and repair it if damaged.
4. Pull stopper -1-  out of the new air bellows.

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   As-delivered condition of air spring (shown as an example)

   Information 

   Before installation, the following parts must be pre-fitted on the air connection of the new air spring:

   • Cutting ring -1- 
   • VOSS threaded joints -2- 

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   Air connection before installation (air spring bellows is not the same as the original)

   Pull the air line briefly against the insertion direction. If it cannot be pulled out, the air line is fitted correctly.

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   Air line fitted correctly

5. Install new rear air bellows (see information on "Installing rear air bellows").