Quote:

The proportioning in most mopar style master cylinders are a rated volume usually aprox,65%fr-35%r.This is volume only,not pressure.They were set this way for the disc/drum combos since large single piston or daul 4 piston calipers required more fluid volume than the small brake shoe wheel cylinder. Most race proportional valves are adjustable from 0 to 1000psi. most common manual brake systems working range is 400 to 600psi.



How can not the preassure differ if the volume does with the same stroke front and rear.
I belive the the mopar MC has different piston sizes front and rear and that would differ the preasure also.
Aldough most aaftermarket MCs like Wilwwod, strange etc have the same piston size front and rear therefore the same preasure.

P-body are you positive with the function of a prop valve?
I thought that a prop valve had two pistons with different sizes to reduce preasure.

Im not very experienced so correct me if im wrong.