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 And Abs Hydraulic Unit, Removing And Installing, RHD: Removing
Component location of the ABS Hydraulic Unit -N55- and the ABS Control Module -J104- in RHD vehicles:
1 - Brake Booster with Master Brake Cylinder
2 - ABS Hydraulic Unit -N55- and ABS Control Module -J104-
Risk of destroying the brake lines by bending.
- Never forcefully bend the brake lines in the hydraulic unit area.
-- Read and note the present control module code.
-- On vehicles with a coded radio, note the code. Retrieve it if necessary.
-- Disconnect the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .
-- Remove the battery tray -1-. Refer to BATTERY TRAY, REMOVING AND INSTALLING .
-- Insert the Brake Pedal Actuator:VAG1869/2 .
-- Remove the noise insulation. Refer to OVERVIEW - NOISE INSULATION .
-- Press the locking mechanism downward -arrow A-.
The illustration shows the installation position of the ABS Hydraulic Unit -N55- and the ABS Control Module -J104-.
-- Release the connector -arrow B-.
-- Remove the connector -1-.
-- Attach the bleeder bottle bleed hose -1- to the left front brake caliper breather valve.
-- Open the breather valve.
-- Attach the bleeder bottle bleed hose -1- to the left rear brake caliper breather valve.
-- Open the breather valve.
-- Push the brake pedal at least 60 mm using the Brake Pedal Actuator:VAG1869/2 .
-- Close the left front and left rear bleeder valves.
-- Do not remove the Brake Pedal Actuator:VAG1869/2 .
-- Place enough lint-free cloths under the ABS Control Module -J104- and the ABS Hydraulic Unit -N55-.
Pay attention that brake fluid does not run on the ABS Control Module -J104- contacts.
-- First label both brake lines from the brake master cylinder -A- and -B-.
-- Remove both the brake master cylinder brake lines -A- and -B- from the ABS Hydraulic Unit -N55-.
-- Immediately seal the threaded holes with the plugs from the assembly repair kit 5Q0 698 311.
-- Label the remaining brake lines (brake caliper) and remove. Seal the threaded holes -2-.
-- Place the dust caps for the bleeder valves on the brake lines.
-- Remove the ABS Hydraulic Unit -N55- -1- together with the bracket -2- in the -direction of the arrow-.
-- This will remove the rubber buffers -arrows- from the bracket stud bolts -3- at the same time.
-- Guide out the hydraulic unit from the vehicle.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.