Quote:
Originally Posted by JAJ
It's about a lot of different variables that aren't always obvious. The M3 works its rear brakes pretty hard, and with stiff springs (less weight transfer) and Rcomps you load them up even more. Other cars, like my new Mustang, are quite different in that regard, but that's too OT for this thread.
If I had to pick the single most challenging issue with the stock rear brakes on an M3, it would be that of finding good track pads to match with the front. Decent BBK pads are available from lots of vendors. Finding matching rears that retain good balance and don't overload the thermal capacity of the rear brake assembly is harder than it looks.
For street use this is not an issue - you don't need a BBK in the first place.
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A good place to ask would be Turner or Fall Line since they run BBK front and stock rear calipers... but they probably won't tell you a whole lot for competitive reasons.