Control Module, Separating From Hydraulic Unit: Notes

2025 Audi A4 allroad Premium PlusSECTION Notes
  • 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.
  • The return flow pump may not be removed from the ABS Hydraulic Unit -N55-.

Special tools and workshop equipment required 

  • ESD Work Surface:VAS 6613 
    Fig 1: ESD Work Surface
    GWWW00-11877Courtesy of AUDI OF AMERICA, LLC
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.