The farther out a brake track is the more torque (braking power) you'll get for the same pad pressure. Move the identical brake twice as far from the axle and you'll get double the braking force. It's a simple question of leverage, and explains why the extreme case (rim brakes) can operate with such low pad pressures.
Though I'm not a disc brake fan for various reasons, this is one often overlooked advantage. Brakes can be individualized for various riders, especially those with weaker hand strength simply by using larger rotors (if the mounting system allows it).
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FB
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Last edited by FBinNY; 11-01-16 at 11:35 PM.