Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Module And Hydraulic Unit, Installing: Notes
Do not remove sealing plugs at new hydraulic unit until the corresponding brake line is about to be installed.
If the sealing plugs are removed too early, brake fluid can escape and unit may not be sufficiently filled or adequately bled.
-- Install In Reverse Order Of Removal.
-- Before installing the bracket for the ABS Hydraulic Unit -N55-, spray the rubber buffers with silicone lubricant D 007 000 A2, which makes the installation easier.
Make sure that the rubber buffers are not pressed out when installing the bracket. After installing the hydraulic unit with the control module, check for a secure fit; otherwise malfunctions may occur.
-- Remove the Brake Pedal Actuator:VAG1869/2 .
-- Bleed the brake system. Refer to BRAKE SYSTEM, BLEEDING .
-- Enter Radio Code.
-- Code the ABS Control Module -J104- using the Vehicle Diagnostic Tester in "Guided Fault Finding".
-- After replacing the ABS Control Module -J104-, an additional basic setting must be performed.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.