You can only hold maybe 25-30 PSI with your finger over the brake line hole. The system will operate at up to 2500 PSI. So if you can move them with compressed air they will easily move with the brake pressure applied.
Some things to do:
1) Remove the bleed screw and liberally cover it with anti-seize. I have had much better lucky with the copper high temperature product over the silver zinc base kind.
2) Install the brake cylinder on the mounting plate. Install the return spring and make sure it will pull the piston back down. If it does than you have no worries. If it does not then something is not correct. Take it apart and see if the cup is the correct one for the bore. Measure the small part of the cup. It should match the bore. If it does then maybe the bore is not smooth enought. Hone it some more and see what happens. Also use silicone lube rather than the brake fluid when putting it together. The brake fluid is not a very good lubricant. Put some between your fingers and rub and you will see what I mean. It is actually close to a solvent.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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