Control Module and Hydraulic Unit

Fig 1: Exploded View Of Control Module And Hydraulic Unit

Courtesy of AUDI OF AMERICA, LLC

Nut
- 3.8 Nm
Nut
- 3.8 Nm
Bracket
Rubber Bushing
Mounting Bracket
Bolt
- Tighten in two steps alternating from side to side.
- Step 1: 1 to 1.5 Nm (to position the seal)
- Step 2: 2.5 Nm
ABS Control Module -J104-
- 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-.
- Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING
- Can be replaced separately if faulty.
- Refer to CONTROL MODULE, SEPARATING FROM HYDRAULIC UNIT
- Refer to CONTROL MODULE, INSTALLING ON HYDRAULIC UNIT
ABS Hydraulic Unit -N55-
- 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-.
- Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING
Brake Line
- 14 Nm
- To the brake caliper
- 5.25 mm diameter and union bolt with M12x1 thread
  CAUTION:
  Risk of destroying the brake lines by bending.
  
  - Never change the shape of the brake lines.
  
  - A damaged or bent brake line must be replaced.
Brake Line
- 16 Nm
- From brake master cylinder to the hydraulic unit
- 6 mm diameter and union bolt with M12x1 thread
  CAUTION:
  Risk of destroying the brake lines by bending.
  
  - Never change the shape of the brake lines.
  
  - A damaged or bent brake line must be replaced.
Bolt
- 25 Nm
Nut
- 3.8 Nm

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 Contact
- 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
- Do not remove or lift
- Cannot be replaced separately
Valve Body
- Must not be damaged
- Do not use any tools
Pump Motor Contact
- Must not be damaged

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