The switch I am referring to is located under the dash and just above the brake pedal arm and it is a plunger type switch that is used for both the cruise control disengage and brake lights. Simply replacing the switch without correct adjustment will not solve the problem. If the switch is adjusted to high, it will shut off the cruise with a slight bump because the brake pedal will also bounce with the bumps also. Even higher or loose in the switch holder and it can cause bad behavior. I advise this as a first course of action because most owners can perform this adjustment themselves without cost. If this is not the problem, then proceed to the next possible problem which would be the control unit. I am referring to the Ford or GM chassis gas engines. Air brakes and some hydraulic systems use a pressure sensor as a switch that would be located in a different location and would require replacement of that sensor. Just try the easy stuff first, then move on. The vast majority of the time, it is the brake switch that has moved out of proper adjustment. Hope this helped.
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