Well guys,

I bought some fluid in a bottle called Evaporust at O'Reilly Auto Parts and put my wheel cylinders in a small loaf baking pan and filled it up with this stuff. I checked on them today and the Evaporust had turned completely black. When I pulled the cylinders out, they were looking like new! I jiggled several things around and the adjusting screws broke free and I was able to take 3 out of 4 of them out. One of the endcaps broke free as well. Now the Evaporust is able to completely fill the area between the remaining frozen endcaps and the pistons. I'm leaving them to soak until all the parts come free. I cannot believe how well the Evaporust works! I'm glad I pushed forward with restoring these instead of buying new.

Thanks!
jose