alright, heres what happened. Friday i was driving and my brakes worked fine. Saturday morning when i woke up and drove my car, the rear brakes made a grinding sound on my first stop. i was a little concerned but on my next stop they sounded fine. i continued to drive the rest of the day with no prob. When i woke up on sunday and drove my car, there was a more serious grinding and a jerking in my car from the rear brakes, i was really worried and drove around the block but after a few stops no sounds or any problems. I dont know much about drum breaks, what could my problem be, do they just need new pads or something?