ABS hydraulic control unit, assembly overview: Notes

1996 Audi A4 Base, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

Tightening torque for all brake lines on the Audi A6 is 15 Nm.

NOTE: The following list refers to items in Fig 1.
  1. Brake master cylinder and brake servo 
  2. Brake line 
    • Brake master cylinder/primary piston circuit to hydraulic unit
  3. Brake line 
    • Brake master cylinder/secondary piston circuit to hydraulic unit
  4. Brake line 
    • Hydraulic unit to left-front brake caliper
  5. Brake line 
    • Hydraulic unit to right-front brake caliper
  6. Suction dampers 
    • Design to improve pressure build-up during operation of EDL
    • To be discontinued gradually (will be incorporated in the hydraulic control unit)
  7. Brake line 
    • Hydraulic control unit to left-rear brake caliper
  8. Brake line 
    • Hydraulic control unit to right-rear brake caliper
  9. Hex nut, 10 Nm 
  10. Hex bolt, 10 Nm 
  11. Bracket 
Fig 1: Identifying ABS Hydraulic Control Unit Assembly (Bosch 5.3 ABS/ESP)
G02732807Courtesy of AUDI OF AMERICA, INC.
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.