MBM 4 wheel disc brake conversion master cylinder question

Chuck Schoolcraft said

Where are the residual valves? I just changed my brakes from drum/drum to all disc also, and heard a late 90's caravan master would work good? Should I just keep the drum/drum mc and remove residual valves, or change master cylinders? And to what mc?

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I have 4 wheel discs on my 68 fastback , keep the stock splitter/residual valve , I run a 15/16'' 1987 diplomat master cyl. , stops well , but I cant lock them up . If I ever get the urge , I might go to a 7/8'' master cyl. .
72blunblu has a lot of experience in these matters ----- could also call doctor diff too .