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.
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.