DT: TRUCK WAS PARKED AND ENGINE WAS NOT RUNNING, CONSUMER DROVE ABOUT A HALF HOUR BEFORE HE DISCOVERED VEHICLE WAS ON FIRE. FLAMES WERE COMING FROM DRIVER'S SIDE UNDER HOOD NEAR CAB OF TRUCK. FLAMES WERE EXTINGUISHED BY 4 WITNESSES WITH A FIRE DISTINGUISHER. FIRE DEPARTMENT WAS NOT CALLED. MECHANIC ON SITE OPENED HOOD AND SUSPECTED THE FIRE BEGAN NEAR THE MASTER CYLINDER. NO REPAIRS WERE MADE SINCE THIS OCCURRED. *AK