2020 concours with 9500 miles . I was just into 2nd gear while leaving a traffic light under perfect weather conditions in Florida and my councours began to bog down . The brakes were engaging without any action on my part . I came to a stop in the middle of the lane and my friend on a 13 year old concours who was following me hit my left bag and went down in the median . My friend and his bike were fine. The truck behind him stopped and we horsed my bike onto the median . My brakes remained fully engaged for 2 minutes or so and then finally relaxed . I rode around the nearby parking lot and then rode it 5 minutes home. It seems that for some reason the master cylinder fully engaged . If that had happened at a higher speed I might be dead . Im going to Trailer it to my closest dealer. Anybody else ever experience this or have a better idea what happened ?