Quote:
Originally Posted by MEvang
This sound is very likely the pad being move back and forth. I would bet they machined runout into your rotor. The pad is being kicked around. This will also cause a low pedal the first time you hit the brakes as you now have to push the pads back against the rotor. Leave it go and it will begin to pulsate at some point.
You will likely need to replace the rotors now,
Mike
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You can have runout even if the rotor resurface was perfect. It's caused by runout in the hub assembly.
If excessive runout is found to be the cause, change the orientation of the rotor and measure the runout. Repeat until you can reduce the measured runout. If you cannot solve the problem this way, you'll need to either resurface the rotors using an on-the-vehicle lathe or use runout correction shims.