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      10-05-2012, 11:59 PM   #31
M3 Esq
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Drives: M3, 335i, X5
Join Date: Aug 2007
Location: CT

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Stop tech actually advises (through materials located on its website) that, in terms of performance, really only a front BBK is needed as the majority of the stopping power in our cars is in the front. While not directly on point, this informs as to what is actually necessary in terms of the rear brakes. In other words, if you want to get a rear BBK, 345mm will be more than enough. If you want show, we'll that's up to you.