Removing and installing power-assisted steering box — AUDI

🧭 Before you start

Fits: platform code 4A

• Opens: brake fluid
• Special tools named: 3094

Don't miss

• Move the steering wheel to the centre position and do not turn during repair work, as this could damage the coil connector of the airbag unit. — Disconnect the battery 27.
• Take care not to damage the bellows of the steering box, the steering pinion splines and the refrigerant pipes of the air conditioner.
• Make sure the cables are correctly positioned.

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ Move the steering wheel to the centre position and do not turn during repair work, as this could damage the coil connector of the airbag unit. — Disconnect the battery 27.
2. Unscrew the front wheels.
3. Remove the anti-roll bar (right arrows).
4. Unscrew the air pipe holders on the right and left (left arrows).
5. Detach the air pipes.

6. Remove the top part of the air cleaner.
7. Unscrew the bottom part of the air cleaner (arrows), press to the rear and lift out.
8. Remove the right and left distributor cap.
9. Unfasten the cable tie (bottom arrow), remove the steering damper (top arrow) and lift out.
10. Bend open the tabs of the locking plate and unscrew the track rods (arrows).
11. Unscrew the nuts from the track rod ends.
12. Press the track rods off the steering arm.
13. Prise both track rods out of the holder and the locking plate.
14. Take out the track rods through the opening in the corresponding wheel housing.
15. Take out the locking plate with holder.
16. Remove the bottom left storage compartment.
17. Take out the air vent in the footwell on the left.
18. Screw out the bolts of the universal joint (arrows).
19. Detach the universal joint from the steering box.
20. Take out the bulkhead collar.
21. Pinch off the suction and return pipes with hose clamps 3094.
22. Unscrew the expansion hose (1) and return hose (2) from the rotary slide valve housing.
23. Vehicles with Servotronic: Unplug the connector at the Servotronic valve.
24. Whilst providing support at the T-piece, unscrew the return pipe of the brake servo (1) from the T-piece.
25. Unscrew the expansion hose (2) from the pressure pipe.
26. Seal the T-piece and pressure pipe with a dummy plug.
27. Push the expansion hose aside.
28. Unscrew both bolts of the steering box in the left wheel housing (arrows).
29. Screw out the right steering box bolt (arrow).
30. Screw out the bolts of the Procon-ten mounting bracket on the right side and press aside the mounting bracket downwards.
31. Unfasten the cable tie for attaching the wiring harness from the bulkhead.
32. Take the steering box out of the mounting bracket and guide the wiring harness round the steering box to the rear.
33. Take out the steering box to the right through the wheel housing (two mechanics required). [Note: Take care not to damage the bellows of the steering box, the steering pinion splines and the refrigerant pipes of the air conditioner.]
34. Insert the steering box, paying attention to correct positioning of the wiring harnesses.
35. Carefully re-insert the bulkhead collar.
36. Fasten the holder into the bellows.
37. Screw both bolts for track rod attachment loosely into the holder.
38. Plug in the connector for the Servotronic valve.
39. Provide the annular nipples for the expansion hose (1) and the return hose (2) with new seals and screw the banjo bolts loosely into the rotary slide valve housing.
40. Insert the steering box in the bulkhead collar and the bracket on the right.
41. Insert the right steering box bolt.
42. Insert and tighten the left steering box bolts.
43. Tighten the right bolt.
44. Screw the expansion hose to the pressure pipe whilst providing support at the hexagon of the expansion hose.
45. Whilst providing support at the T-piece, screw the return pipe of the brake servo into the T-piece and secure.
46. Attach the return hose and expansion hose to the rotary slide valve housing such that neither makes any contact.
47. Detach the hose clamps 3094 from the return hose and suction hose.
48. Fit the Procon-ten mounting bracket (insert the lower bolt first and then the upper bolt).
49. Tighten the lower and then the upper bolt to 75 Nm. [Note: Make sure the cables are correctly positioned.] — 75 Nm (55 lb-ft)
50. Screw the left bolt out of the holder for track rod attachment.
51. Insert the left track rod in the holder and loosely screw in the bolt.
52. Screw the right bolt out of the holder for track rod attachment.
53. Insert the right track rod in the holder and loosely screw in the bolt.
54. Only tighten the two bolts to torque with the vehicle standing on its wheels.
55. Pay attention to correct positioning of the holder in the bellows.
56. Install the steering damper:
57. Attach the wiring harnesses with cable ties to the bulkhead and cable holders.
58. Fit and secure the right and left distributor cap.
59. Slip the universal joint onto the steering pinion.
60. Insert and tighten the steering column/universal joint bolts.

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Removing and installing spring – Audi Q5 · 1 torque figures
• Removing and installing power and control electronics for electric drive · 3 torque figures
• Separating engine and gearbox - vehicles with manual gearbox · 4 torque figures
• Removing and installing convertible roof cover – Audi · 2 torque figures
• Removing and installing multimedia system operating unit E380 · 5 torque figures