knocking when I turn on 2006 Mercedes-Benz R500

When I make turns there is a knocking that I can feel in the floor board.

by in San Antonio, TX on March 03, 2010
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1 answer 1 comment
ANSWER by , March 12, 2010
I had the same problem and it was the steering knuckle. It was repaired under warranty but I do think there is a service bulletein for this.
COMMENT by , March 20, 2012
just started having same problem after buying a 06 r500 did the new knuckle fix problem?