I suspect not many folks will be in the market for BBK on E89s but thought I'd post this anyway..
So the show stopper issue is E89s have an integrated electronic parking brake embedded into a relatively normal single piston sliding caliper.
This means that the normal route of potentially many DIY and specific BBKs for the rear of E89s don't exist.
There are two custom designs from a HK and Taiwanese companies but they are abouy £2,500 landed in UK and to my eyes have a slighly gauche style.
One US guy had a crack at it but it turned into a Vietnam with multiple issues only overcome with lots of unique hand crafting and machining..even filing down pads.
I've been working on the same logic but starting from different points.
You can see the details here...
z4-forum.com
Anyway now on the way on this..with my 550BHP E89 felt a better solution was required rather than the stock rear brake..
So the show stopper issue is E89s have an integrated electronic parking brake embedded into a relatively normal single piston sliding caliper.
This means that the normal route of potentially many DIY and specific BBKs for the rear of E89s don't exist.
There are two custom designs from a HK and Taiwanese companies but they are abouy £2,500 landed in UK and to my eyes have a slighly gauche style.
One US guy had a crack at it but it turned into a Vietnam with multiple issues only overcome with lots of unique hand crafting and machining..even filing down pads.
I've been working on the same logic but starting from different points.
You can see the details here...
Its a rear big brake kit Jim, but not as you know it!
The subject is BMW Z4 E89 rear brake upgrades. The key point is that the E89 was one of the first BMWs to use the TRW integrated electrically operated parking brake which is part of what otherwise is an unremarkable sliding pin single piston rear caliper. Because of this, its very difficult to...

Anyway now on the way on this..with my 550BHP E89 felt a better solution was required rather than the stock rear brake..
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