STARTED VEHICLE NORMALLY AND AS SOON AS THE BRAKE WAS APPLIED, A LOUD 'POP' SOUND WAS HEARD BEHIND THE DASH AND A LARGE AMOUNT OF SMOKE CAME INTO THE CAB FROM THE A/C VENTS. I CONTINUED FOR ABOUT ONE MINUTE. THE VEHICLE WAS SHUT OFF AND PARKED IN PLACE. THE SMOKE SUBSIDED. THIS IS CONSISTENT WITH THE PROBLEMS INDICATED IN THE SPEED CONTROL DEACTIVATION SWITCH RECALL AFFECTING 1993 FORD F-250 VEHICLES CAUSING UNDER HOOD FIRES. HOWEVER, AFTER CONTACTING FORD, THEY INDICATED THAT MY PARTICULAR VIN WAS NOT INCLUDED IN THE RECALL, AND I WOULD BE RESPONSIBLE FOR THE COST OF TOWING AND ANY REPAIRS.