The noise could go away with some hard braking, which would remove the glazed material. Obviously it's difficult to do hardbraking on the rear wheel without locking it up, so you should take some fine sandpaper (220) to the disc and some corse sand paper to the brake pads. Brake pads should wear away the ceramic to reveal fresh material, but when a person does light braking or rides the brakes, instead it heats up the ceramic into a hard smooth surface, which is called glazed.
Don't use the rear brake. Isn't 70 or 80 percent of your stopping power up front?
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