LOSS OF BRAKE FLUID, LEAKED THROUGH TO CRUISE DEACTIVATION SWITCH INTO CRUISE SYSTEMS AND ELECTRICAL COMPONENTS CAUSING CORROSION WHICH CAUSED A SHORT. HAD TROUBLE WITH CRUISE CONTROL WORKING OVER TIME LEAD TO HIGHER FLOW OF CURRENT THAT OVERHEATED AND CAUSED FIRE AT SWITCH UNDER HOOD. FORD SPEED CONTROL DEACTIVATION SWITCH FIRE. THE FIRE ORIGINATED IN THE AREA WHERE THE SPEED CONTROL DEACTIVATION SWITCH IS LOCATED (LEFT REAR CORNER OF THE ENGINE COMPARTMENT AT THE MASTER CYLINDER. THERE WAS EVIDENCE OF SPEED CONTROL DEACTIVATION SWITCH FAILURE PRIOR TO THE FIRE INCLUDING INOPERABLE SPEED CONTROL, REPEATED DIFFICULTY SHIFTING OUT OF PARK. *TR