Air Pipe Line, Servicing

Air Pipe Line, Servicing

Special tools, testers and auxiliary items required

• Torque Wrench (V.A.G 1783)

• Open End Spanner Insert AF 10 (V.A.G 1783/1)

• Air Hose Pliers (VAS 6228)

Procedure

Tightening specifications, refer to => [ Air Line Connecting Pieces Tightening Specification ] Air Line Connecting Pieces Tightening Specification.

If the air line is damaged, the damaged area can be replaced.

If the connection leaks, air line can be shortened by 10 mm and a new connecting piece installed. Refer to => [ Connector Piece, Replacing ] Connector Piece, Replacing.

• The air lines between the solenoid valve block and the pressure reservoir and between the solenoid valve block and the air supply unit are replaced by original lines.

• Clean separation point area before disconnecting air line connector.

• Contaminants entering the lines can lead to system malfunction.

- Clean connector piece area and corresponding separation point.

Separating points overview, refer to => [ Separating Points Overview ] Separating Points Overview.

- Cut through the air line at a right angle at the connector area using (VAS 6228).

- Remove connector piece and air line.






- Then mark ends of air line in vehicle and both ends of new air line with a waterproof pen.

• With 17 mm or 22 mm markings, check whether connector piece is inserted far enough in air line.

- Place foam rubber on both lines.

- Install new line connector.

• Connector pieces in line connector are already tightened to proper torque. Air lines only have to be connected.

- Remove transport protection cap.

- Slide old air line through gaskets - 1 and 2 -.






- Then slide air line with some force through edges - 3 and 4 - of cutting rings as far as stop - 5 - in line connector.

- Slide the foam rubber onto the connector piece.

- Repeat procedure with new air line.

- Connecting piece, replacing, refer to => [ Connector Piece, Replacing ] Connector Piece, Replacing.

Separating Point: Air Line for the Front Air Spring Damper

- Loosen the original air line from the wiring harness.

- Surround the wiring harness properly.

- Service the air line.

- Attach the wiring connector and the new air line to the wiring harness with cable ties.

Separating Points Overview Separating Point: Air Line for the Rear Air Spring

• Route the new air line - item 5 - Separating Points Overview as illustrated.

- Service the air line.

- Attach the bonded wiring connector and the new air line with cable ties.

Separating Points Overview Separating Point: Air Line for the Solenoid Valve Block Inside the Vehicle

• If the air lines on the solenoid valve are damaged, then route the separating point inside the vehicle interior (spare wheel well) due to the short lines.

- Loosen the original air line from the wiring harness.

- Surround the wiring harness properly.

- Service the air line.

- Attach the wiring connector and the new air line to the wiring harness with cable ties.

• The vehicle may be removed from the vehicle hoist only after the air springs have been filled again. Refer to => [ Raising and Lowering ] Description and Operation.

• Make sure the positioning pin on the air spring is installed correctly inside the body before filling the air suspension system. The air spring must be locked secure inside the wheel bearing housing at the same time. Refer to => [ Air Spring Installed Position ] Air Spring Overview.