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This is as easy as it gets. No cables, no nothing. Basically, the bottom curved part of the lever hits the grey circle that's just above it. In hydraulic braking, this generates pressure which causes the disc brake to close in on the wheel's disc (thereby stopping the bike). My bike has a disc brake in front and a drum brake in back. For more information on hydraulic braking, there's a good explanation at Scientific American. It's got a diagram of a car, but the mechanics are the same.

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