manual front drum to KH disc swap

rrvolare said

I am thinking i will order the POWER disc brake master cylinder for 67-69 dart with front disc and rear drum .... reason being that i kept the original distribution block and added in the rear hold off valve that came factory on some darts with this setup brakes ... ANY info appreciated on my suggestion and combination .... AGAIN thanks for all the help!

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I think the "rear hold-off valve" you refer to is actually a "proportioning valve". It was used in the earliest front disk cars (~67-68?, not sure about 64-66). Later, it was incorporated in the distribution/warning/hold-off block, which was then termed a "combination valve". Usually a new adjustable proportioning valve is simpler, cheaper, and better, but you are already plumbed so use that.

One thing to look for is if a power MC will lock the manual push-rod's rubber bushing. I don't know if manual MC's have a groove for that in the piston. Probably doesn't matter since I recall that some years use the same PN for power & manual MC's.

There have been questions/complaints about where the pedal sits for various manual setups. Some think the accelerator and brake pedals should be at the same base height, but others say not. Some have cut and welded manual rods to shorten. The 2-4 adapter makers say they put the MC piston at the correct location when using a newer 2-bolt MC. Of course, adjust your brake switch to match wherever your brake pedal ends up sitting.