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Old 03-12-2011, 11:32 PM   #4
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Join Date: May 2008
Location: Markham
Posts: 456
I rebuilt the front right one on my E39 last fall. Once you've done one or seen it done it is really quite easy. The cause is usually a bit of rust on the piston just under the dust boot. Steel wool and some brake fluid will easily clean up the piston.
'99 E39 540iT

Last edited by MLue1; 03-12-2011 at 11:34 PM. Reason: adding more info
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