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      12-16-2011, 01:07 PM   #5
bigjae1976
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Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Wichita, KS

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2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
My bolts still look good on the ST40 calipers. I regularly spray somewhat harsh cleaner (50% diluted grime reaper) on it pretty regularly.

Yeah, maybe you got bad bolts. Or they were dinged up during the install. I would remove the bolts and let them soak in some rust remover. Then maybe use some zinc spray on bolt heads.
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2013 F30 328i Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red