I always thought it was 70% front and 30% rear.
Its always worked for me.
My brakes did get hot once though,
riding down the tail of the dragon.
I was riding it like a harley, instead of letting the motor do the work
going through the twistys.
A real good guy turned me onto the fact that I "couldn't" ride it like a harley,
its not, doesn't run like one, or act like one.
Totally different ride, and the motor could, and should be doing the work for me on the twistys.
I tried it his way and the second time down was alot more enjoyable.
Brake didn't get hot either.