Quote:
Originally Posted by gr8000
I think its a small rock / debris moving freely between the back of the rotor and the protective metal shield (protecting the rotor from water splashes). Debris / small rocks get captured in there occasionally and the sound is like you are dragging cans arround! I got it once and it drove me nuts. I was checking the car again and again and couldn't find anything. Eventually the rock / debris was out and the sound stoped by itself. Reason you dont hear it at higher speeds is because of the centrifugal force causing the rock / debris to stop moving freely, or because of the louder ambient noise at these speeds making it more difficult to hear.
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I agree with this.
Same issue here too. I brought it in to dealer and had them remove the rear wheel. They could not reproduce the sound, but repositioned the rotor shield. It has been almost a month and no noise to date.