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      12-11-2009, 01:02 PM   #2
JasonNW
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Drives: 2011 Z4 35i
Join Date: Oct 2008
Location: Kirkland, WA

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I was having a similar issue (sounded like I was driving over an empty paint bucket) but when driving in a straight line.

In my case it was brake pad compound from heavy braking rubbing on the rotors. Went away by itself.

Yours sounds a bit different though... I'd just take it to the dealer.