hey guys, sorry i never replied...so ford said during high speed braking, they noticed pulsating in the brakes. they resurfaced my front rotors, replaced rear rotors, and replaced pads all the way around......and the noise stopped. i needed to do pads soon anyway, so i'm glad i did it. weird thing though, they said my rear pads were more worn than my fronts, but they're all OEM pads. not sure how that happened.