Power Disc Brake Master Cylinder Help

[jasinger01]

I’m currently working on a power front disc conversion for my 1969 GMC 1/2 ton 2wd. When I bought it last year, it included some new parts including this brake booster. I used the PN to determine that this is intended for a 1967-1970 C20 ¾ ton truck. I looking to determine if I should try to make this setup work or just buy a different booster/master/prop valve that is intended for a c10.

To make this booster work, I am guessing I would need a C20 master/proportioning valve? I’ve read in the forum that these differ from the C10 parts. I’ve read that the masters are ‘reversed’ in terms of which reservoir is intended to go to the ports on the prop valve, so the lines must cross. If this is a better booster than the C10 parts, I would prefer to utilize it.

Can anyone point me towards a C20 master/prop valve combo that would bolt right up to this booster that I already have? I see some of the aftermarket companies sell master/prop combos but I cannot determine which one would match this style of booster.

If this ends up being too much of a science project, I could just sell it and buy a booster/master/prop valve intended for a c10 from CPP as I have purchased all other CPP components so far. But would like to keep it if C20 parts are a better/stronger product.

Thanks,
Jacob