MY 1997 FORD F-150 TRUCK WAS PARKED IN THE DRIVE WAY IN FRONT OF MY HOUSE.THE KEYS WERE NOT IN THE VEHICLE, AND NO LIGHTS WERE ON. I STEPED OUT THE FRONT DOOR OF MY HOUSE, AND SMELLED SOMETHING BURNING. I LOOKED OVER AT MY TRUCK, AND SAW FLAMES IN THE LEFT FRONT WHEEL WELL, AND SMOKE COMING OUT OF THE HOOD SIDE AND BACK EDGES. I GOT THE FIRE EXTENGUISHER FROM THE HOUSE, SHOT UP IN THE WHEEL WELL, THEN OPENED THE HOOD AND PUT OUT THE REST OF THE FIRE. THE FIRE SEEMED TO START IN THE BRAKE MASTER CYLINDER AREA, AND I BELIEVE AS A RESULT OF A DEFECT IN THE CRUISE CONTROL DEACTIVATION SWITCH. THE MASTER CYLINDER IS DESTROYED,AN EVAPORATIVE EMMISSION CONTROL VALVE AND SOLENOID ARE DESTROYED, AND SOME WIRING HARNESSES HAVE BEEN BURNT.THE REAR ANTI LOCK BRAKE CONTROL VALVE IS DAMAGED. THE LEFT COWL COVER AND HOOD SEAL MELTED, AS DID THE LEFT INNER WHEEL WELL.I HAVE NOT REPAIRED THE TRUCK AT THIS TIME.