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.
Anti-Lock Brake System - BENDIX-4: Description
Bendix-4 Anti-Lock Brake System (ABS) is designed to prevent wheel lock-up during heavy braking at more than 3 MPH. This allows operator to maintain steering control while stopping vehicle in shortest distance possible. Major components are master cylinder and booster, modulator and pump/motor assembly, 4 wheel speed sensors, and Controller Anti-Lock Brake (CAB). See Fig 1 . ABS also includes 2 warning lights (Red BRAKE and Amber ANTI-LOCK).
ABS has a self-diagnostic system for trouble shooting and system malfunction warning. ABS uses hydraulic power assist for normal power-assisted braking and to provide a source of high-pressure hydraulic fluid during anti-lock braking. Pedal feel is similar to conventional vacuum-boosted brake system. If additional force is applied during anti-lock stop, or if brake pedal is released and re-applied rapidly, driver may notice a very hard pedal feel. This is due to isolation of master cylinder during ABS operation, as wheel brake pressure is fed from modulator assembly.
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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.