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.
ABS Control Module -J104- / ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING: Installing
Install in reverse order of removal while noting the following:
-- If necessary, install the hydraulic control unit bracket.
-- Insert the hydraulic control unit just far enough into the vehicle in order to connect the connector -3-.
-- Carefully push the hydraulic control unit -1- into the pins -arrows-.
- The hydraulic control module must rest in all pins.
-- Remove the plug.
-- Insert the brake lines -1 and 2- into the ABS Hydraulic Unit -N55- and then install the union bolts by hand and tighten.
-- After securing the brake lines to the hydraulic unit select the "Hydraulic connections, basic setting" program. Refer to DIAGNOSTIC ENTRIES .
-- Remove the Brake Pedal Actuator:V.A.G 1869/2 .
-- Remove all cloths from the vehicle that were previously placed down.
-- Bleed the brake system. Refer to HYDRAULIC SYSTEM, BLEEDING .
-- Complete the "Control module, replacing" program after replacing the hydraulic control unit using the Vehicle diagnostic tester .
Faulty brakes increase the risk of an accident.
- Make sure the brakes are working correctly before driving the vehicle for the first time.
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.