Stop! Before you grind away your rotors. If the noise is from the front you are likely down to the backing plate on the pads. They probably need replacement. I don't remember when the switch occured to rear discs, but I believe you have rear drums and you DEFINATELY don't want to run the shoes down and risk scoring the drums, they are incredibly expensive. So stop now and have them checked or get back to the board and some of the mechanics can walk you through replacement.
Best,
g
'64 230sl, fully sorted out...ooops, spoke too soon