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Drag Brake
From WikiPedalia
A brake that can be set so that it will stay on even when the rider lets go of the control lever. This is usually a drum brake operated by a friction-type shift lever. Tandems are often equipped with a drag brake when they are to be used for touring in mountainous terrain. Descending with a heavily-laden tandem using only rim brakes can cause the rims and tires to overheat, leading to blowouts.
See my article on Tandem Brakes.
