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U-brake
From WikiPedalia
A form of cantilever brake that works like a centerpull caliper. The upside-down "L"-shaped arms cross over above the tire, so the left brake shoe is operated by the right side of the transverse cable. A U-brake uses studs that are above the rim, rather than below it, as with conventional cantilevers. It uses the same type and placement of studs as roller-cam brakes do.
