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      11-16-2012, 11:03 AM   #3
xenon
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Drives: 2018 A6 Avant S-Line
Join Date: Jun 2008
Location: Coventry

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It's the pads moving backwards and forwards, probably the pads are pattern parts and are a slightly different size. You might check the guide bolts are tight and the anti-rattle springs are firm but I wouldn't worry too much.
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Ian
Current: 2018 A6 Avant S-Line MMI+
Previous: 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2