Help brake rattle !

kilojade

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On my rs6 c7 witch I have had 1 week now there is something rattling on the brakes. Like a metallic rattle. When I apply the brake the sound changes to more of a winding noise. It doesn't always rattle only when have either been down a bumpy rd or over speed bumps it's like it's loosening summit up!

Spoke to the guy who I got car off and he said he heard that noise when he had the pads changed. He put apex pads in not Audi pads.

Any ideas?