Apologies, Dan - but I'm trouble sorting through the posts that link to posts, that link to posts... And much of this seems to pertain to drum to disc swaps. Because I bought new 13" tires, and because I can't put discs on a 13" wheel, I'm going to stick with drums - but hope at least go to a dual master cylinder (no power brakes). Given my plan, is this MC that you link in one of the subposts appropriate for my application? And, no proportioning valve needed?