What happened
The flight proceeded normally from departure through the touchdown phase of landing. However, upon application of the wheel brakes following touchdown, the pilot found that both brake pedals traveled all the way to the floor without providing expected resistance.
By pumping the brakes, the pilot managed to achieve some braking action via the right brake only. It became evident that the aircraft could not be stopped within the remaining 2,700-foot runway and that there was insufficient distance available to perform a go-around. To avoid further uncontrolled movement on the active runway, the pilot allowed the aircraft to veer to the right, exiting the runway and entering the run-up area, where the aircraft underwent a ground loop.
The pilot noted that during the two previous landings performed earlier that morning, the braking system had functioned correctly. There were not injured.