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Panic Over
I spent a couple of days thinking through design ideas for the brake system, and another day working it all out on a spreadsheet to get the bias percentage. No matter what variation I tried I couldn't get a reasonable front/rear split - but now I know why!
After some research on Brembo website I can see that using REAR master cylinders for both front and rear systems I was raising the front circuit fluid pressure higher than normal - should be 19mm(approx) for twin disc setup NOT 13mm which is std for single disc. Correct that error, but that's not the reason!
Then I read suggestions above, and whilst evaluating ideas I saw a TYPO in my spreadsheet - simply dropped a "0" from a dimension. FOOL!!
Anyway now its all good!
The bias comes out at 63% front and 37%rear which is pretty much what I had hoped for. Although the CBR twin front discs are a bit overpowering it is made up for by the very overpowering ZR750 rear piston sizes which restores the balance.
Thanks to those above for input - now I'll get on and build it up!
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