Incident Overview
A pilot performed a precautionary landing in order to secure the cabin door. After touching down, the airplane executed a high-speed right turn from the runway onto the taxiway. During this maneuver, the aircraft ground looped.
Brake System Condition
Following the incident, it was noted that the right pilot's left brake pedal exhibited a spongy feel, while the other brake pedals functioned normally. Subsequent inspection revealed that air was bled from the left brake cylinder.
Recent Maintenance History
The day before the incident, the floats had been removed from the airplane and the wheels were reinstalled. This landing marked the first time the pilot utilized the right set of brakes since the wheel reinstallation.