[dblthebass]

i am a michigan state certified brake technician

well redrockets-10, the first logical thing to do is get a brake job. ignoring any abnormal sound on a vehicle is not smart at all. and there is no possible way for a rock to get into a brake drum they are completely sealed off, well exept for water of course, if you can't get your drums off hit them with a sledge hammer that will knock the rust off. even if the pads are new it could be the metallic metal shavings in the pad itself but if they are grinding even if you let off i am almost 100% sure you need new pads