I have manual brakes with O.E. quad piston disc in front & drum in the rear, not sure what size drum, I am trying to find a good MC for this but for a decent price. Everything that I find is either manual drum fronts & rear or power drums. I don't know if that makes a huge difference or not being I have manual disc up front.

You would just need a MC that has the machined recess in the rear piston "thimble" about halfway down for the manual pushrod with the neoprene snip on the end of it to lock into. all that is left is the bore dia. I used a 1&1/8 alum dual MC one on my dart with 2.75" discs/10" drums & it was perfect tho on paper the bore dia is supposed to require a too high of pedal effort (& I ain't that strong). I'd email the Doc & see what he says. MC's are pretty trouble free and a parts house reman is fine

I did try Doc, his are on B/O for at least two months. I cant get technical info from part houses around here. They see part numbers only and IDK what I need. I can describe what you recommended and see if that brings up any info at O'reilly, Advanced, or the Zone. Not much to choose from unless Jegs or Summitt. Do you have a brand name in mind that is built as you describe? Thanks,, JL2

no brand name in mind on a reman & iirc I asked for the 1&1/8 & it was a truck MC. You have 4 piston discs in front? at the time (this was way back) I wanted as little pedal travel as possible & did not even realize the pedal effort problem that could have arisen from that choice & people have reported severe pedal input needed with the wrong bore dia choice (not sure why I skated by). I think I'd just get a 1&1/8 bore reman unit, they're dirt cheap & now that I think about I think I had to provide the black top part with the bowl/lids cuz they expect you to use your old one & the parts house had one in their pile that was turned in with the bowl still there that they gave me.

What year?

See this write up with manual front discs using 15/16" '73 Duster MC:

http://www.billsgarage.info/BarracudaBrakes.shtml

1968 Barracuda

This was used on the later manual disc brake A-bodies:

http://www.amazon.com/Bendix-11627-Master-Cylinder/dp/B000C2L8FM