I have a 2000 V6 w/ mods and a custom tune. It has an auto trans. Lately there has been a grinding noise when the brake is released. Also when the car is shifted to P, D, or R there is the grinding noise. i can't hear it really when the vehicle is in motion but only when stopped. Anyone have any idea as to what this could be. there is 110,000 on the car so it could just be wearing out.