Are you sick and tired of people debating the merits of road disc brakes? Me too! So today I'm going to rain all over a different parade: cable-operated disc brakes.
Cable disc brakes are not the best at anything. If you set them up perfectly, they can work pretty well, but proper adjustment is a moving target and in really mucky conditions (like on a peanut-butter-sticky ‘cross course, for example) you may find yourself twiddling a barrel adjuster more often than seems reasonable.
'Traditional', single-piston cable disc brakes are an inherently less-than-wonderful design. With a single piston, only one brake pad moves, pushing the disc rotor against a second, fixed pad. This means that every application of the brake involves bending the rotor slightly, and that the pads will never both make perfect, perpendicular contact with the braking surface. Uneven pad wear is all but inevitable, and you need to keep on top of adjustment for your brakes to work properly.
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For many years, this was the state of the art in cable disc brakes, and calipers like the Avid BB7 and its cheaper, slightly less adjustable little brother the BB5 were the benchmark. They worked OK and they certainly offered more outright stopping power than rim brakes, but in the cold light of day they basically sucked quite a lot.
The obligatory caveat
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