well I just replaced the stock pads and rotors with power slot rotors, and hawk hps pads and i'm getting a thuding sound from the front left when I come to a complete stop. We think it might be that the rotor might have been machined wrong from the factory, because it seems to be leavig a imprint line about half way around the rotor on the outer edge. Everything else seems to be fine. Do you thing this has anything to do with me not installing the shims. It does not sound like squeking noise. Please everyone please chime in on this, because I need your help.