Getting my *** handed to me.. these damm brakes

Brooks James said

I bought a brand new master cylinder for my 70 Dart, factory discs. It sat for 12 yrs in a dry garage without the plastic plugs to cover the the holes . I dont what happened but it would not bench bleed even with the return hoses. I bought another one. Problem fixed.
Possible internal rubber pieces deterioation, or dried out ???

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My first M/C on the Barracuda was a 25 year old unit that I rebuilt. I pulled it out of a 5 gallon pail and gutted it, Physically there was nothing wrong with it. And it worked fine afterwards. But it was bigger than 1 inch, and I wanted to try a smaller one. I did not have one so bought a rebuilt which also worked fine. I liked it and it stayed on the car.
As far as I know, that first unit that I rebuilt, ended up back in the pail......

Some units are just particular about bleeding. I use clear hoses on the bench so I can see what is going on, cuz sometimes they need help. What I have seen is that the fluid just shuttles back and forth in the clear lines being sucked back into the master, instead of being replenished from the compensating ports. I just pinch the clear lines at the end of the downstroke before lifting. This forces the pistons to draw thru the C-ports. Problem solved. Once the compression chambers are purged of air, the lines no longer require pinching.
You probably just had one of those cranky buggers.