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Lip
Flouese, if you look at your rotors, you will likely see a very thin rusty edge at the very outside face of the rotor. The disk brake pads don't come in contact all the way to the very outside edge of the rotor, their contact ends where the shiny part of the rotor ends. The shiny part of the rotor is worn down and made thinner by the brake pads over time. The outer edge is the original thickness of the rotor and rusts due to not being contacted by the brake pad. So if that lip edge is very pronounced, it means the rotor has been worn too thin and needs to be replaced when a brake job is done.
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Threaded Mode
