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On most mechanical disc brakes you have one brake pad that sits next to the rotor (like a car brake). The other pad then moves and squeezes it all together. A lot of times, people have the rotor centered evenly between those pads, or they'll have the moving pad situated right next to the rotor. This pushes the rotor all the way over towards the stationary pad before you actually get the brakes to apply—although it's subtle, the brakes won't feel very good and the rotor ends up getting bent.

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