Diagnostic System

1987 Ford Bronco 5.0 N, Automatic, AODSECTION Diagnostic System

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). A Yellow light indicates a malfunction in the system. This light should come on for approximately 2 seconds when ignition is turned on or engine is cranking. When control module detects a malfunction, the anti-lock brake system becomes inoperative and the Yellow warning light will come on.

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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.