Removing and installing ABS control unit J104/ABS hydraulic unit N55, MK25 — AUDI

🧭 Before you start

Fits: VW Transporter T5 (7H), VW Transporter T6 (7E)

• Opens: brake fluid

Don't miss

• Do not bend the brake lines in the area of the hydraulic unit! — Note or request radio code on vehicles with coded radio if necessary.
• Do not remove brake pedal depressorV.A.G 1869/2.
• Ensure no brake fluid gets onto contacts.

📋 Procedure

1. ⚠ Do not bend the brake lines in the area of the hydraulic unit! — Note or request radio code on vehicles with coded radio if necessary.
2. Disconnect battery Electrical system27Battery; Disconnecting and reconnecting battery.
3. Remove bolt (arrow).
4. Remove trim (1) on left next to battery.
5. Unbolt cooling system expansion tank and lay to side without opening cooling system.

6. Detach lines (1) from fuel filter (2).
7. Loosen clamp (3).
8. Lay fuel filter to one side.
9. Release control unit connector in direction of (arrow), and pull it off.
10. Apply brake pedal depressorV.A.G 1869/2.
11. Connect bleeder hose of bleeder bottle to bleeder valve of front left brake caliper.
12. Open bleeder valve.
13. Depress brake pedal at least 60 mm using brake pedal depressorV.A.G 1869/2.
14. Close front left bleeder valve.
15. Do not remove brake pedal depressorV.A.G 1869/2.
16. Place sufficient lint-free cloths under the control unit and hydraulic unit. [Note: Ensure no brake fluid gets onto contacts.]
17. Disconnect brake lines (1) from hydraulic unit.
18. Seal brake lines and threaded holes using sealing plugs1H0 698 311 A.
19. Unscrew bolt (arrow) from bracket for control unit/hydraulic unit.
20. Unscrew bolts (arrows) from bracket for control unit/hydraulic unit.
21. Remove hydraulic unit together with control unit. [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.]
22. After tightening brake lines, tighten hydraulic unit.
23. Remove brake pedal depressorV.A.G 1869/2.
24. Bleed brake system .
25. Code radio.
26. Coding ABS control unit J104: .

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