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- AND ABS Hydraulic Unit -N55-, WITH ABS MARK 60 EC ABS/EDL/ASR/ESP
Special tools and workshop equipment required
- Torque Wrench 5-50Nm VAG1331
- Torque Wrench VAG1410
- Brake Pedal Actuator VAG1869/2
- Bleeder Bottle
- Tool Set for Brake Bleeding VAS6564
Install the transportation protection after removing the ABS Hydraulic Unit -N55-.
The warranty on the ABS Hydraulic Unit -N55- will not be honored if there is no transportation protection.
1 -
Transport protection for valve domes (foam)
2 -
Sealing plugs M10
3 -
Sealing plugs M12
Removing
Component Location:
The ABS Control Module -J104- is attached to the ABS Hydraulic Unit -N55- and is located inside the engine compartment on the right side.
- ABS Hydraulic Unit -N55- with ABS Control Module -J104-
- brake booster with tandem master cylinder
Do not bend the brake lines near the ABS Hydraulic Unit -N55- !
Use the Vehicle Diagnostic Tester.
- Chassis
- Brake System
- Anti-lock braking system ABS/EDS/ASR/ESP Mark 60 EC
- Function
- Check coding in the ABS control module J104
Disconnect battery ground strap for all further work. See if a coded radio is installed. Get the anti-theft code beforehand, if necessary.
-- Disconnect the battery, refer to Removal and Installation .
Disconnecting the battery can result in damage to electronic components.
- Complete the steps for disconnecting the battery.
-- Remove the noise insulation, refer to Description and Operation .
-- Remove the catalyic converter -1-, refer to Catalytic Converter, Removing And Installing .
-- Remove the nuts -1- and remove the heat shield -2-, if equipped.
-- Disconnect the connector from the ABS Control Module -J104- -in direction of arrow-.
-- Unclip the cover -2-.
-- Unclip the brake lines -1- on the bracket -3-.
-- Insert Brake Pedal Actuator VAG1869/2.
-- Depress the brake pedal at least 60 mm with the Brake Pedal Actuator VAG1869/2.
-- Remove front left caps -1-.
-- Remove rear left caps -1-.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.