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      04-30-2019, 01:47 AM   #120
Bozman52
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Drives: 2015 M5
Join Date: Nov 2017
Location: Cambridge

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You will not need to upgrade your master cylinder with the 760/550 brake upgrade. DARKKNIGHT put 4-piston X5M calipers on his F10 and did not upgrade the master cylinder. My understanding is that if you go for the full M5 brake retrofit, which is not a simple bolt on mod, then you'll have to upgrade the master cylinder.
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