Its sounds fine. I cant see a video in the vid, but I am assuming you put it in drive and slowly let your foot off the brake but not completely, when you do that the sound comes out correct?

Are you running OE pads and rotors or something else? In any case, the sound is normal. Nothing to worry about.

Also sounds like you are running a 3.0d.

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2011 E70 50i M Sport