Control Module, Attaching To Hydraulic Unit

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Assembling

NOTE:

Replace the bolts after disassembly.

-- Clean the sealing surface on the hydraulic unit -2- with a plastic scraper -1-.

Fig 1: Cleaning Sealing Surface

Courtesy of AUDI OF AMERICA, LLC

Be careful not to damage or bend the valve body -3-.

CAUTION:

Risk of malfunction.

The sealing surface on the hydraulic unit must have a clean, even surface.
Replace the hydraulic unit if the sealing surface or contact tags are damaged.
The seal on the control module cannot be replaced.
The seal on the control module must not be pulled out or raised up.

NOTE:

Do not use aggressive cleaning agents (use cleaning agent enclosed).

Check sealing surface for damage (visual check).

CAUTION:

There is a risk of destroying the ABS control module.

Moisture and dirt particles must not enter the inside of the control module.
Do not use compressed air to clean the control module or hydraulic unit.
Protect the control module from bumps or impact. A control module that has fallen to the ground can no longer be used.

-- Check the valve body inside the hydraulic unit for damage.

CAUTION:

Risk of malfunction.

The hydraulic unit cannot be used again if the valve body is damaged or bent.

The hydraulic unit -4- with the pump motor and the connector -3- faces down.

Fig 2: Identifying Hydraulic Unit
Courtesy of AUDI OF AMERICA, LLC

-- Mount the control module on the hydraulic unit carefully from the top with the valve coils hanging.

NOTE:

Be careful not to tilt the valve coils.

-- Install the bolts (do not tighten) until the control module touches the hydraulic unit evenly.

-- Tighten the bolts diagonally.

After tightening check

if all the bolts have made contact,
if the control module and hydraulic unit are touching all the way around.

-- Install the hydraulic unit, refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .

After Replacing the Control Module and Bleeding the Brake System

-- Select the "Replace" function for the ABS Control Module -J104- /ABS Hydraulic Unit -N55- using the Vehicle Diagnostic Tester in Guided Functions .

All the ESP warning lamps must go out.

Tightening Specifications

Refer to OVERVIEW - CONTROL MODULE AND HYDRAULIC UNIT