EK1 brake upgrade

[Surrufus]

im planning to upgrade my EK1 CXi rear drums to discs
i know that my current front discs and calipers are the same size as the EK4 equivilants so i dont need to worry about those
the question i put to you fellow ozhonda members is as follows:
do i need to upgrade the EK1 CXi brake master and booster cylinders or are they the same size and capacity as the EK4 units?

[SLOWEGG]

You shouldn't need too, but you should change your proportional valve.

[egSi]

You shouldn't need too, but you should change your proportional valve.

^ what he said.

they are cheap from the wreckers, less than $30