[Small Yellow]

I think i know whats wrong. Mine did the same. You know how yhere is two pads per caliper? And based on the OEM pads, one of the pads has a clip that goes into the piston. Either cool carbon does have the clips or they (or one) broke off. What happens is the pads is rattling (in other words when griping the rotors theyre ramming the calipers making that sound.

I was also thinking wtf? But then I realized the side that was making that sound was the side where the pad clips broke off. Replaced them (Porterfield R4) with Carbotech xp12s and no problems since.

Id give that a look at first before going the OEM route.