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"Therefore a proportioning valve is necessary no matter if you have discs or drums in the rear. If you look at new cars, the front discs are larger diameter (bigger moment lever) than the rears and that is how the 75% ratio is engineered in. But, aftermarket kits are usually all the same size so a proportioning or ratio valve is needed."
Not necessarily. The Wilwood pedal assembly has a mechanical proportioning system built in. You can change the front rear bias in less than a minute.