Sequence of Events
The pilot reported that during the takeoff roll, the aircraft accelerated to approximately 65 knots. However, as the pilot rotated the plane for takeoff, it began to slow and veer to the left. The pilot reduced power to abort the takeoff and regained directional control, but the brakes were ineffective in stopping the aircraft. Subsequently, the aircraft continued off the end of the runway, then struck a fence and a parked vehicle.
Pilot's Observations
The pilot believed that when he released the parking brake, it did not fully disengage. He then suspected that heat built up as the brakes were dragging during the takeoff roll.
Brake Examination
An examination of the brakes confirmed that heat damage had occurred, consistent with the pilot's belief that the parking brake may have been partially engaged.
Conclusion
The incident sequence and the subsequent brake examination support the pilot's account of the events.