1989 Ford Bronco II 4WD, Standard, M5OD-R1FACTORY OEM SERVICE PROCEDURE

Anti-Lock Brake System: Testing: Notes

NOTE: ALWAYS disconnect positive battery cable before measuring resistance on RABS system. Always check connectors for dirty or corroded terminals before condemning circuit.

Rear Anti-Lock Brake System has a self-test capability. There are 2 warning lights, located on instrument panel, to inform driver of malfunction. Red warning light indicates low fluid level, parking brake on or low vacuum (diesel models). When control module detects a malfunction, the anti-lock brake system becomes inoperative and the Yellow warning light will come on. Both lights should come on for approximately 2 seconds when ignition is turned on or when cranking engine.

Factory Service Tools

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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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