Quote:
Originally Posted by Lewis@MWDesign
No BBK upgrades for the rear yet but I am tempted to try the Performance rear bbk calipers. Been trying to cross reference with the rear brake parts used on the Z4 with parts used on other models, no luck. The Z4 rear brake assembly are unique to it's model.
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There is one brake upgrade available for the rear. I would know, I just ordered it.
In short, the 35iS has larger rear brakes by almost an inch in diameter, around 320-something mm vs the stock 300mm.
As far as brake balance is concerned, I don't have the piston size of the OEM rear performance kit, so I can't determine what its native bias is, but the iS rear should correctly balance out the front calipers. Otherwise your brake bias will be off and your braking will actually get worse.