REPLACED FUSE THAT HAD BLOWN ON CRUISE CONTROL ON 1998 FORD RANGER. STEPPED ON BRAKE TO PUT IN GEAR AND NOTICED EXCESSIVE SMOKE FROM UNDER HOOD. OPENED HOOD AND FOUND MECHANISM IN FRONT OF MASTER CYLINDER RESERVOIR ON FIRE. SMALL FIRE TORCHED FRONT OF RESERVOIR I PUT OUT THE FIRE WITH A TOWEL BREAKING THE MECHANISM, CRUISE CONTROL BRAKE DISCONNECT. *NM