Spent decades in a tire and brake specialty shop. Rebuilding brake cylinders was SOP. I always honed with brake klean. Lubricants don't let the hone do it's job well enough and can leave contaminants. As others have said, check to see if the cups are the correct size as mismarked or mispackaging is not that uncommon. The brake pistons also need to be buffed off as they commonly get built up corrosion that will (most commonly) bind the cylinder. Brake assembly fluid is the only correct lubricant to reassemble the cylinders with (hard to come by these days I've found). Regular brake fluid (dot 4) is meant to be hydroscopic to hold moisture in suspension and will promote corrosion on the pistons. Silicon fluid (dot 5) will not hold moisture but withstand more heat. The silicon downside theory is that water droplets will settle in spots and rust through a line (I think that is nonsense myself). It is also not compatible with dot 4, (which is why it does not make a great assembly fluid), and requires complete system flushing to change over to do it correctly. The silicon upside is that if you spill it on your paint it won't hurt it. If the cylinder is aluminum you can't hone it. Of course "farm repairs" don't count.
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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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