Master Cylinder

I am not aware that new wheel cylinders do not need the residual valve or have the valves inside them. I have always seen the residual valve(s) (or check valves) in the MC. So, no you could not use a disc/drum MC, unless you get a separate residual valve to put inline with the front drums for now.

Some info on residul valves types: http://www.mbmbrakeboosters.com/ind...tent&view=category&layout=blog&id=8&Itemid=16