Well my bike tried to kill me today. I worked out a few problems and sure enough as soon as i do another one takes its place. I was crossing an intersection when suddenly my rear brakes locked up on me and killed the bike. I looked down and my rear brake pedal was pushing my foot pedal up. So i manage to semi unlock them and fight the brakes the rest of the way home. Does anyone know why that would happen or what to do to unlock them?