Control Module, Separating From Hydraulic Unit

WARNING: This page is about a different car, the 2022 Audi SQ5, 2021 Audi S4, and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

ESD Work Surface :VAS6613

CAUTION:

This procedure contains mandatory replaceable parts. Refer to component overview prior to starting procedure.

Mandatory Replacement Parts

Bolts - Control Module to Hydraulic Unit

NOTE:

The transverse and longitudinal acceleration sensors are installed in the ABS Control Module -J104-. The sensors cannot be replaced.

If the ABS Control Module -J104- is faulty, it can be replaced separately.

If the ABS Hydraulic Unit -N55- is faulty, it must be replaced together with the ABS Control Module -J104-.

NOTE:

The ABS Hydraulic Unit -N55- with the ABS Control Module -J104- must be removed in order to separate the control module and the hydraulic unit.

CAUTION:

There is a risk of destroying the hydraulic unit.

The return flow pump may not be removed from the ABS Hydraulic Unit -N55-.
The circuit board is exposed when the ABS Control Module -J104- is removed.
Moisture and dirt must not enter the control module.
Avoid electrostatic charge. Touching electronic components can cause malfunctions.

The seal on the control module must not be pulled out or raised up.
Blowing the control module or hydraulic unit out with compressed air is not permitted.
The valve bodies inside the hydraulic unit must not be damaged or bent.

Procedure

-- Remove the hydraulic control unit. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .

CAUTION:

There is a risk of destroying the hydraulic unit.

Touch a grounded object (ESD Work Surface :VAS6613 before disconnecting the components.
Do not touch the connector terminals or electronic components directly.

-- Place the hydraulic unit with the control module on the ESD Work Surface :VAS6613 .

The control module -2- faces upward and the hydraulic unit -4- with the pump motor and connector -3- faces down.

Fig 1: Identifying Hydraulic Unit
Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -1- and dispose of them.

-- Carefully remove the control module vertically upward without tilting.

-- Cover the open hydraulic unit with a lint-free cloth.

-- Check the hydraulic unit sealing surface, and if necessary, clean with mineral spirits and a lint-free cloth.

-- A damaged sealing surface must not be mechanically reworked. A hydraulic unit with a damaged sealing surface must be replaced.

CAUTION:

There is a risk of destroying the hydraulic unit.

The seal must not be pulled out or raised up. The seal cannot be replaced.