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I would imagine that if you hit something hard enough and with enough force to puncture the caliper itself that you would have heard or seen it. I think that maybe the puncture to the caliper happened during the impact.
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2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R |