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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGPRE-DIAGNOSIS TESTING & PREPARATIONPREPARATION
1996 Audi A4 Base, Standard

Pre-Diagnosis Testing & Preparation: Preparation

1996 Audi A4 Base, StandardSECTION Preparation

Test results are dependent on correct operation of several related non-ABS components and systems. Check following before attempting to diagnose ABS system.

  1. Ensure fuses No. 3 and 12 are okay. Ensure ABS is turned on and ground connection at hydraulic modulator is tight. Check connections at hydraulic modulator for leaks.
  2. Ensure brake components (pads, rotors, etc.) are okay. Ensure fuse on anti-lock power supply relay (located on auxiliary relay panel) is okay.
  3. Ensure ignition switch is in ON position for all ABS tester tests unless otherwise specified. Turn ignition off before connecting or disconnecting ABS control unit.
  4. To find faults in system, follow testing procedure completely in specified sequence. After determining system fault, repair cause, and repeat entire test procedure starting from TEST 1.
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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.