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HOMESERVICE MANUALSAUDI1999A8 QUATTROREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTWARNING SYSTEMSON BOARD DIAGNOSTIC (OBD) - ABS/EDL/ASRABS/EDL AND ABS/EDL/ASR BOSCH 5.3SAFETY MEASURES AND BASIC RULES FOR TROUBLESHOOTINGTEST REQUIREMENTS
1999 Audi A8 Quattro

Test requirements

1999 Audi A8 QuattroSECTION Test requirements
  • Permissible and identical wheels and tire size Correct tire pressure at all wheels.
  • Mechanical and hydraulic parts of the brake system must be in order: Hydraulic connections and lines are not leaking (visual check of ABS Hydraulic Unit, brake callipers, wheel brake cylinder, tandem brake master cylinder).
  • Wheel bearings and wheel bearing play OK.

    See SUSPENSION - FRONT .

    See SUSPENSION - REAR .

  • Wheel speed sensors must be installed correctly.

    See ANTILOCK BRAKE SYSTEM .

  • Supply voltage OK (at least 10.0 V).
  • Connector properly attached to ABS Control Module (w/EDL) -J104-, catch engaged.
  • The diagnosis procedure can only be started with the vehicle stationary and the ignition switched on (or with engine running). The diagnosis cannot be started if wheel speed exceeds 2.75 km/h. Diagnosis is terminated if speed exceeds 20 km/h.
  • While testing the ABS, ABS/EDL and ASR systems, ensure that the vehicle's electronics are not subjected to electromagnetic interference: keep the vehicle away from equipment with a high current draw such as electric welding units.
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.