[Frodo]

I'm getting ready to replace the brake pads on all 4 wheels. The rotors seem to be in decent shape, but have worn a little. There is a thin lip just outside where the pads have worn into the rotors---it's not much, certainly less than 1 mm (but probably more than 0.5 mm). I was talking to a technician at a local Porsche dealership and he said, while these rotors shouldn't be turned, he did say they could be put on a brake lathe and just have that lip taken down.

Does that sound like good advice? My kid wonders why that's even necessary, and I'm not sure I have an answer to that. Recommendations?