Sounds like a pad rattle. You may have a bent or lose anti rattle shim which could allow the pad to be loose fitting. If this is the case it won't hurt anything. As said above you may also have a worn slider bolt. You can check the caliper and pads for looseness yourself or have a shop do a free inspection for you.
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Last edited by hkshooter; 03-11-2016 at 08:21 PM..