I just picked up a garage sale bike for my 9 year old. It's in great shape, and she loves it, but the brake cables going from the frame to the hand levers, are missing. I thought that I might just pull off all of those, since she prefers the pedal brake. Can I easily add a pedal brake (i.e. bike brakes when pedals go backward)? Will it work? It currently free wheels (clicks when pedaled backwards, like a 10-speed). Thanks!