...for that sort of lip, I would suggest a new set of pads will sort it out for you until the next time for a pad and disc change. I have never favoured turning brake discs, they are cheap enough to be able to purchase a pair of full thickness new ones. It is almost the same as using someone else's oil out of the sump drain at the local garage when you take it for an oil change. Buy new ones and ride safe and confident. It is after all, only a few dollars for new brakes. ( well, I think so ! )

__________________
1993 190E 2.0L (Euro.) sold
1991. 500 SEL (Euro.)
1991. 300 CE (Euro.) sold
1993. 500 E (U.S. spec.)