Hot,
I don't think its a warped rotor. They don't make any noise as far as I know. With a warped rotor you would feel a pulsing in the brake pedal.
Check to see if the caliper is tight. You may have to put a washer under the head of the bolt that mounts the caliper. This happened to me. Is the locking device (that you bend up the ears) under the caliper bolt?
P E H
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