My '06 Mustang GT Coupe has a runout at the rear hub where the brake rotor goes onto of .006". Should i try putting a rotor shim on it or is that normal. My rotors and pads are new. but I'm still getting a pulsation in the steering wheel when the brakes are applied. Also, is that why they want you to get your rotors resurfaced while they are still on the axle, to make up for the runout? Thanks for any info you could give me on this.