ABS Control Module -J104- / ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING, LHD VEHICLES: Notes

2025 Audi Q3 PremiumSECTION Notes
  • 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-.

Special tools and workshop equipment required 

  • Vehicle Diagnostic Tester
  • Open Ring Spanner Insert - AF 11mm :V.A.G 1410/6 
    Fig 1: Open Ring Spanner Insert - AF 11mm V.A.G 1410/6
    GWWW00-11610Courtesy of AUDI OF AMERICA, LLC
  • Torque Wrench - Universal Joint :V.A.G 1410/7 
    Fig 2: Torque Wrench - Universal Joint V.A.G 1410/7
    GWWW00-11661Courtesy of AUDI OF AMERICA, LLC
  • Brake Pedal Actuator :V.A.G 1869/2  .
    Fig 3: Identifying Brake Pedal Actuator
    GWWW00-11589Courtesy of AUDI OF AMERICA, LLC
  • Bleeder bottle from the Bleeding Equipment :VAS 6860  or Brake Charger/Bleeder Unit :VAS 5234  with bleeder hose -1-.
    Fig 4: Brake Charger/Bleeder Unit VAS5234
    GWWA02-0334Courtesy of AUDI OF AMERICA, LLC
  • Plug from the Repair Kit :1H0 698 311 A  M10 -2- and M12 -3-
    Fig 5: Identifying Sealing Plug Repair Set, Part No. 1 H0 698 311 A
    GWWN45-0039Courtesy of AUDI OF AMERICA, LLC
  • Plugs from the Assembly Part Set :5Q0 698 311  : M10 -1- and M12 -2-
    Fig 6: Plug 5 Q 0 698 311
    GWWN45-10322Courtesy of AUDI OF AMERICA, LLC
  • Safety Gloves
RENDER: 1.0x

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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.