ok I am not sure how to explain this, but when I am backing up mostly when I am backing out of my friends driveway that is at an angle, I hear this crunching kind of noise out of my drivers side front end. I am wondering what it is. I already had the front assembly replaces on that side and it still does it. Is it possibly just the brake pads adjusting as the rotor turns? I replaced my brake pads, but not the rotors so I am wondering if they are warped that maybe I am just hearing my brakes adjust to the warp. Anyone know?