Postaccident Examination Revealed That The Right Brake Linings Had Exceeded The Manufacturer’S Serviceable Wear Limit Analysis: The pilot was taxiing from the fixed-base operator’s building to the runway. As he increased brake pressure to stop the airplane before the runway hold short line, it turned to the left and completed a full 360° turn before coming to rest. The passenger then offered to try his brake pedals but the airplane only turned to the left; the pilot and passenger concluded they had no control of the right brake. The passenger then observed a fire emanating from under the right wing. The airport’s aircraft rescue and firefighting personnel responded and extinguished a fire associated with the right brake assembly. The right wing’s lower surface sustained substantial thermal damage during the ground fire.