Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM/TRACTION CONTROL - 5.3DIAGNOSIS & TESTINGPRELIMINARY CHECKS
1998 Audi A4 Avant Quattro, Automatic
Preliminary Checks
1998 Audi A4 Avant Quattro, AutomaticSECTION Preliminary Checks
- Ensure all wheels and tires are of approved size (all 4 identical) and tires are properly inflated.
- Conventional brake system in proper working order and stoplight switch is operational.
- Brake fluid must be at proper level and no hydraulic lines leaking.
- Check wheel bearing play and condition. Correct as necessary.
- Check wheel speed sensor mounting and build-up of dirt etc.
- Check condition of all fuses.
- Battery voltage must be at least 10.5 volts.
- Ensure ABS control module harness connector is securely connected and is not corroded or damaged.
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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.