After two other emergency responses in two hours the Reiffton Fire Company and companies 3 and 7 were dispatched to Rt. 422 and Rt. 82 westbound for a reported tractor trailer on fire. Crews arrived on scene to find the rear brakes of the trailer fully involved with fire. Engine 7 arrived on the scene and went into service. Engine 2 supplied engine 7 with water. All crews assisted with fire suppression and overhaul. Units cleared the scene in about one hour.