ABS Control Module -J104- and ABS Hydraulic Unit -N55-

Fig 1: Identifying Hydraulic Unit

Courtesy of AUDI OF AMERICA, LLC

Bolt
- 4.5 Nm
ABS Control Module -J104-
- Information for exchanging control modules, refer to CONTROL MODULE, SEPARATING FROM HYDRAULIC UNIT .
- Control module, replacing, refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
Wiring Harness Connector
- Do not disconnect the connector (47-pin) before successfully completing On Board Diagnostic (OBD).. Turn off the ignition before disconnecting the connector.
ABS Hydraulic Unit -N55-
- Removing and installing, refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
  CAUTION:
  There is a risk of destroying the hydraulic unit.
  - The pump motor may not be separated from the ABS Hydraulic Unit -N55-.

ABS Control Module -J104-

Fig 2: Identifying Pressure Sensor Contact, Pressure Sensor, Seal, Valve Bodies And Pump Motor Contact

Courtesy of AUDI OF AMERICA, LLC

Pressure Sensor
- Do not touch the contacts
- The illustration depends on the model
Pressure Sensor
- Must not be changed or damaged
- Cannot be replaced
- The illustration depends on the model
Seal
- Must not be pulled out or raised up
- Cannot be replaced
Valve Bodies
- Must not be damaged or bent
- Do not use any tools on the valve bodies
Pump Motor Contact
- Must not be damaged or bent

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.

Safety Warning

Overview - Control Module And Hydraulic Unit