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Another question from the inexperienced guy! So I swapped out to disc brakes on the Galaxie. I harvested a hydroboost and master cylinder from an Astro van that had a disc/drum setup. Will I have issues using the disc/drum master cylinder on a car with disc/disc brakes?
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Short answer:
Yes
Long answer:
There is a residual pressure valve of 10# for most drum brakes. The concept is a little pressure in the line helps the shoes of drum brakes engage sooner but only being 10# it is not enough to cause the drum brakes to drag. With disc brakes 10# would cause the brakes to drag, premature pad where and excessive rotor heat. In some cases you can remove the residual pressure valve and in effect make the MC disc/disc. I only glanced at this video but it looks like it covers the basics on removing the valve.
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Makes sense, thanks. One more question...I understood that with master cylinders, the larger reservoir always supplied the front brakes and the smaller reservoir the rear. I read in another form that with the Astro Van master cylinders it is the opposite? Or did the writer mean the larger reservoir is at the rear of the reservoir which is opposite of normal? So now I am second guessing myself. Can anyone verify this? 
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in the master pictured the front (smaller) reservoir does the rear and the rear (larger) reservoir does the front.
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Daze, thanks again for the info. I appreciate the help.
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Dan
It's good to understand the reason for the way things work
in Drum brakes the shoes return after being released. this forces the fluid back into the master cylinder
in Disc brakes the pistion in the caliper does not return, so brake fluid in the master cylinder for
the disc brakes goes down as the pads wear.
Again in the drums the even though the shoes wear, they still return to the anchor .
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