master cylinder for stock front disc + empi rear discs

[Angelo Amato]

interesting read,

my maths too are bad maybe i should stay away from formulas !

Angelo

[Wally]

Originally Posted by Angelo Amato

interesting read,

my maths too are bad maybe i should stay away from formulas !

Angelo

Which is agood idea, as there are too many variables!

I tried reasoning with it too and it is totally useless trying to calculate it, although I agree with most of EvilC's post ;-)
Just try out one combo and change according to your experience. Works much better for me.

I now have 993 rear brakes (30/34 cups) at the rear and GT2 rear brakes (330x28 with 28/30 cups) at the front with stock MC.
While the cups are much BIGGER at the rear, I still have quite a noticeble front bias as the front still locks up (too) easy and I have really the most front weight beetle of most here...
How you explain that?
So, just try and adjust, try and adjust

[flat]

Originally Posted by Wally

I tried reasoning with it too and it is totally useless trying to calculate it,

Good point Wally, I've come to the same conclusion. On paper it shouldn't work, or the bias should be way off but in practice it works great!

Also, when working out a brake system, don't get tied up on the hydraulic bias calculations because overall you are concerned with brake torque. There is a hydraulic component to the brake toque calculation, but there are additional variables like moment arm (disk diameter) and the friction coefficient of the pad.

I've got the Boxster S brakes (318x30, 40/36 F and 298x24, 30/28R...IIRC) with a stock 19mm dual circuit and I do have a slight front bias. Works great, I don't think I could improve this setup with aftermarket MC's...

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