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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System - Rear >> Diagnosis >> Symptom Diagnosis >> Symptom "B" - One Or Both Rear Wheels Lock-Up

Symptom "B" - One Or Both Rear Wheels Lock-Up

  1. If valve assembly failure is suspected, check for:
    • Damaged valve assembly reset switch.
    • Leaky dump valve.
    • Hydraulically inoperative valve assembly.
  2. If speed sensor output low or loss at lower vehicle speeds is suspected, check for:
    • Gap between speed sensor and sensor ring greater than 0.050" (1.27 mm).
    • Speed sensor or speed sensor ring does not produce sufficient voltage (650 millivolts) output.
  3. If basic brake mechanical problem is suspected, check for:
    • Brake related problems such as damp or contaminated rear brake linings, stuck or leaking wheel cylinder, or overadjusted rear brakes.
    • Hung-up parking brake.
    • Leaking rear axle seal.
  4. If a 4WD system mechanical/electrical problem is suspected, check for:
    • Hubs engaged although shift lever is in 2WD position.
    • Faulty 4WD indicator switch or short to battery voltage in 4WD circuit.
  5. If a vehicle electrical problem is suspected, check for:
    • Brakelight input to control module missing.
    • Brakelights inoperative.