1987 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE

Anti-Lock Brake System: Description

The anti-lock brake system consists of an ABS control unit, a hydraulic modulator, system relays, speed sensors, and necessary wiring. See Figure -Figure . An ABS defeat switch is located on the dashboard.

The ABS defeat switch allows the driver to turn the system on or off as desired. If the ABS system is locked out, stopping the vehicle and restarting it will automatically engage the ABS system once again.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.