I'm installing a D60 front & 14ff rear with disc brake conversion on my 91 Jimmy. Do I need to install a differant master cylinder to give me more fluid capacity as well as bigger bore ? Maybe one from a 1 ton. I know the brake calipers on the D60 are bigger than my 10 bolt had and now I'll have calipers on the 14ff in the rear. I'm planning on installing a knob style proportioning valve inside the cab so I can adjust the brake bias. I would appreciate any help here I can get.