i figured I would start a new thread since this might be a problem some people will not have encountered before, since i hadnt seen this before (even though im new to focii. so i had a grinding sound coming from the back right that would happen on hard breaking and on launch. it started about a week and a half ago and was barely audible, but the past couple days its been really really bad. so even tho i had done it before, i checked my rotors and saw this:
for comparison here is the other side:
so took the wheel off and took the caliper off, and one of the caliper pins was frozen solid. i tried pouring oil and wd 40 and it wouldnt budge, so i am taking it to the shop tm to get them to free it up hopefully. found out that these pins should be lubed up every time you change brake pads, because if not they will rust to hell and freeze up. the more you know!!!