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Speed Control Does Not Disengage When Brakes Are Applied

  1. Step on brake pedal. Check for proper stoplight operation. See BRAKELIGHT SWITCH TEST. Repair stoplight circuit if necessary. If stoplights operate properly, go to next step.
  2. Check vacuum dump valve. See VACUUM DUMP VALVE TEST. Service vacuum dump valve if necessary. If vacuum dump valve is okay, go to next step.
  3. Check servo. See SERVO TEST. Tap servo body lightly while testing. Replace servo if defective. If servo is okay, go to next step.
  4. Substitute known good amplifier. If amplifier is okay, recheck all electrical and vacuum connections.
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