I posted this issue in the past. What I've done to temporary stop it or reduce it is to replace the caliper guide bolts/slides and grease the heck out of it. This stops the rattling but after a few months it starts returning. So my question is, anyone else having this problem with this style of guide pin/bolts? Do you think it might just be that the caliper mounting bracket that the guide pins/bolts go in and out of might be worn out? Both sides do it. Any thoughts?