My brakes did the same thing.
I have a 2001 Boxster S and my brakes just did the same thing (posts gouging rotors). I have quite a few mm before I even get close to the wear sensors on the pads, but have a groove exactly like your first post.
Did you ever find out what really caused it? Was it the wheel bearing, a mis-aligned post, crappy pads or do these things just do that?
You are the only other person I can find that's had this problem. Any ideas?
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