Abstract: The invention contemplates a bicycle-braking system in which the rear-wheel brake is selectively operable, in which rear wheel braking torque is the means of actuating the front brake, and further in which substantial force-amplification characterizes the actuating connection between (a) rear-wheel torque-reaction pick-off and (b) front brake actuation. Rear-wheel braking torque is noted by physical displacement against a spring, so that if front-wheel brake torque becomes so effective as to substantially reduce rear-wheel brake torque, the spring will automatically react to reduce the magnitude of front-wheel brake effort.