Control Module, Separating From Hydraulic Unit

Special tools and workshop equipment required

ESD Work Surface: VAS6613
TORX^® Insert T25

If the ABS Control Module -J104- is faulty, then the control module is to be separated from the ABS Hydraulic Unit -N55- and only the control module replaced.
If the ABS Hydraulic Unit -N55- is faulty, then replace the ABS Hydraulic Unit -N55- together with the ABS Control Module -J104-.
To separate the ABS Control Module -J104- and the ABS Hydraulic Unit -N55- the unit must be removed.

WARNING:

The return flow pump may also not be separated from the ABS Hydraulic Unit -N55-.
The circuit board is exposed when the ABS Control Module -J104- is removed.
Protect the ABS Control Module -J104- from moisture and dirt particles from getting inside.
Avoid build-up of static electricity!

This build-up of static electricity can lead to malfunctions when contacting electrical components.

-- Touch a grounded object, before working on electrical equipment : VAS6613 . Do not touch directly on the connector terminals or the electrical components.

-- Place the ABS Hydraulic Unit -N55- with the ABS Control Module -J104- on the : VAS6613 .

-- Remove the three TORX^® bolts from the ABS Control Module -J104- and set aside immediately (risk of confusing them with the new TORX^® bolts).

-- Place the ABS Hydraulic Unit -N55- with the ABS Control Module -J104- upward on the : VAS6613 .

-- Remove the ABS Control Module -J104- from the ABS Hydraulic Unit -N55- without tilting it.

Fig 1: Control Module Pulled Off From Hydraulic Unit Without Angling

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Cover ABS Control Module -J104- solenoid coils with a lint-free cloth.

-- Clean the ABS Hydraulic Unit -N55- sealing surface using mineral spirits and a lint-free cloth.

The ABS Hydraulic Unit -N55- sealing surface must not be worked with a file, metal scraper, sand paper or similar.

If the ABS Hydraulic Unit -N55- sealing surface is damaged (for example through grooves or scrapes) the ABS Hydraulic Unit -N55- must be replaced with the ABS Control Module -J104-.

The seal on the ABS Control Module -J104- must not be pulled out or raised up.

The seal on the ABS Control Module -J104- cannot be replaced.