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Yeah, there's a boot around the piston. Sometimes, if you don't spray some silicone spray on it before trying to push the piston back into the caliper, you can get a big bubble protruding from the boot as you push the piston it. If you swing the caliper back down with that bubble still there, the pads could pinch it and it could pop. Never had it happen to me but I see how it could happen.
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