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Self-energizing Brakes
From WikiPedalia
Self-energizing brakes use some of the braking force to provide a "power assist" to the brakes. The best-known self-energizing brake is the Scott-Peterson (Sun Tour)cantilever, which has a steep, helical thread as its pivot, so that the forward force exerted by the rim against the pads helps cause the pads to press harder than they would from hand effort alone.
Self-energizing brakes are quite controversial, because they can have a non-linear response, which may lead to wheel lock-up.
