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, Attaching To Hydraulic Unit
Special tools and workshop equipment required
- Torque Screwdriver: VAG1624
- ESD Work Surface: VAS6613
- TORX® insert T25
Excessive shaking (for example, dropping, impact) can damage the ABS Control Module -J104-. Do not use the ABS Control Module -J104- again if this happens.
- Surface must be cleaned before assembling.
-- Place the ABS Control Module -J104- on the ABS Hydraulic Unit -N55- without tilting it.
-- Tighten the ABS Hydraulic Unit -N55- and the ABS Control Module -J104- with the supplied new TORX® bolts in two steps switching back and forth to the tightening specification.
The ABS Hydraulic Unit -N55- threads for attaching the ABS Control Module -J104- may not be re-cut.
If the thread is damaged, the ABS Hydraulic Unit -N55- must be replaced.
If the bolts are difficult to install by hand or cannot be tightened to the tightening specification, then the thread is damaged.
Tightening Specification
A new ABS Control Module -J104- can be installed on an old ABS Hydraulic Unit -N55- three times, maximum. This assures the elastic seal will not leak.
A used ABS Control Module -J104- may not be installed a second time.
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.