I also brake with my right foot unless I need to prevent from rolling back but even after I have forward momentum I switch back to the right foot. My dad always taught me to brake with the right foot. I have a buddy of mine that he brakes with his left foot. I have tried to brake with my left foot and I just can't do it. It takes me too long to brake and even when I do I either brake to hard or to soft. I did however do this just to see if I could and where no one was around so that I made sure I didn't put anybody in danger.