If you have front end shudder during braking, the problem could be as simple as friction material build up on the rotors. This rotor hone removes all buildup and contaminants from the rotors and restores the surface to like-new. The finish will even have the cross-hatching that new rotors have. Good for use on both stainless steel and cast iron rotors. Uses a common 1/4″ variable speed drill at a low 500 rpm. Instructions are Here.