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.
Section 34 (Anti-Lock Brake System): Description
The 4-wheel Anti-Lock (4WAL) brake system is designed to allow the vehicle to stop in the shortest possible distance while maintaining full steering control. ABS system consists of an ABS Control Module, Hydraulic Control Unit (HCU), 2 front wheel speed sensors and toothed sensor rings, rear axle speed sensor and toothed sensor ring, system diode, main relay, pump motor relay, ANTI-LOCK and BRAKE warning lights and wiring harness.
Two warning lights (ABS and BRAKE) alert vehicle operator of problems in braking system. Red BRAKE warning light monitors master cylinder fluid level and parking brake lever status. Amber ABS warning light alerts vehicle operator to problems in ABS system. See DIAGNOSIS & TESTING .
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.