The pilot made an approach and landing to a 4,094 feet long by 80 feet wide, asphalt runway. During the landing roll, the pilot applied light braking to slow for an upcoming taxiway. While braking, the aircraft drifted left of the runway centerline. The pilot then applied right rudder and right brake which, the pilot believed to be ineffective. The aircraft veered off the runway and collided with a taxiway marker, resulting in the collapse of the left main gear and substantial damage to the fuselage. A post-accident examination of the braking system revealed no malfunction or failure.