Quote:
Originally Posted by PaulE
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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Exactly!
Here is a picture of a rotor lip:
Got a break wear light
From that post:
The only way to know for sure is to measure, but by feeling the lip or lack of it, if the lip is > 1mm it is time to replace the rotor.