I just encountered a weird problem. I went for a quick ride to try out some new parts. Just through the parking lot, no off road or dirt. As I was nearly home the front brake started making a grinding noise. When I checked it out, it has a perfect line around the rotor. I pulled the pads and there's a corresponding slot in the pad. They're the ceramic pads and 203mm cleansweep rotors FWIW. I couldn't find any debris in the pad, just a little metal from the rotor. The score isn't bad enough to hurt anything but I don't want it to happen again.
Anyone ever have this happen and is it common? I'm assuming it was something that got between the pad and rotor somehow and it was gone by the time I checked it out. Any known problems with ceramic pads? I wasn't using the brakes much, they were barely warm.
My only worry was that maybe it was some impurity in the pad that accidentally got in the mix.
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