Removing and installing control unit and hydraulic unit, RHD vehicles — VW

🧭 Before you start

Fits: VW Golf VII Variant (BA), VW Golf VII (5G, 2012–2020)

• Opens: brake fluid

Don't miss

• The illustration shows installation position of ABS hydraulic unit N55 and ABS control unit J104 on a LHD vehicle.
• Do not remove brake pedal depressorV.A.G 1869/2.
• Make sure no brake fluid gets onto electrical contacts on ABS control unit J104.
• First, mark the two brake lines (A) and (B) coming from brake master cylinder.
• Mark and unscrew remaining brake lines (brake calipers). Seal threaded holes (2).

📋 Procedure

1. Read out and note the existing control unit code.
2. If vehicle has a coded radio, note radio code or, if necessary, request it.
3. Disconnect battery Electrical system27Battery; Disconnecting and reconnecting battery.
4. Remove battery tray (1)Electrical system27Battery; Removing and installing battery tray.
5. Apply brake pedal depressorV.A.G 1869/2.

6. Remove noise insulation General body repairs, exterior66Noise insulation; Assembly overview - noise insulation.
7. Press down retainer catch (arrow A). [Note: The illustration shows installation position of ABS hydraulic unit N55 and ABS control unit J104 on a LHD vehicle.]
8. Release electrical connector (arrow B).
9. Pull off electrical connector (1).
10. Connect bleed bottle bleed hose (1) to bleed valve of front left brake caliper.
11. Open bleed valve.
12. Connect bleed hose of bleed bottle (1) to bleed valve of rear left brake caliper.
13. Open bleed valve.
14. Depress brake pedal at least 60 mm using brake pedal depressorV.A.G 1869/2.
15. Close front left and rear left bleeder valves.
16. Do not remove brake pedal depressorV.A.G 1869/2.
17. Place sufficiently lint-free cloths under ABS control unit J104 and ABS hydraulic unit N55. [Note: Make sure no brake fluid gets onto electrical contacts on ABS control unit J104.]
18. First, mark the two brake lines (A) and (B) coming from brake master cylinder.
19. Disconnect the two brake master cylinder brake lines (A) and (B) from ABS hydraulic unit N55.
20. Seal threaded holes immediately using sealing plugs from the assembly part kit with part no. 5Q0 698 311.
21. Mark and unscrew remaining brake lines (brake calipers). Seal threaded holes (2).
22. Fit dust caps of bleeder valves onto brake lines.
23. Pull off ABS hydraulic unit N55(1) together with bracket (2) in (direction of arrow).
24. The rubber dampers (arrows) will be pulled off the studs of bracket (3) while doing so.
25. Guide hydraulic unit out of vehicle. [Note: Remove sealing plugs from new hydraulic unit only when the corresponding brake line is to be fitted.If sealing plugs are removed too early from the hydraulic unit, brake fluid can escape, and it can then no longer be guaranteed that the unit can be sufficiently filled and bled.When installing the hydraulic unit, ensure that the rubber dampers are not pressed out of bracket.]
26. Before installing holder of ABS hydraulic unit N55 on bracket, spray rubber dampers with silicone lubricantD 007 000 A2.
27. Using assembly toolV.A.G 1410/8, carefully fit brake lines.
28. Start brake line union screws in sequence (1) through (6).
29. Tighten break line union screws in sequence (1) through (6).
30. Remove brake pedal depressorV.A.G 1869/2.
31. Bleed brake system .
32. Code radio.
33. Code ABS control unit J104 using .

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