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If you can find a rebuild kit for them, and you are decently mechanically inclined, tear them apart, clean them up, and see if you can rebuild them.
You want to look for a couple of things.
One, the rust seizing up the pistons is most likely on the outer lip of the cylinder. This lip is between the piston boot and seal. Clean it up good. Sandpaper works well. If you have a dremel, that is another good way.
Make sure you don't rough up the cylinder surface behind the piston seal. This you want as smooth as possible. If it is pitted from rust, the caliper is no good to you, unless you have good machining capeabilities.
When you reassemble, use brake fluid to install the piston. Make sure it is 100% STRAIGHT going into the cylinder. If it doesn't go in smoothly, it isn't. Remove and reinstall.
For the sliding pins.
Use brake assy grease. Or antisieze.
You want something that won't gum up with time [regular grease does this] or melt under heat [regular grease does this too].
It's a pretty simple job.
If you have any questions, post up here, and if I remember, or someone else knows, they can answer.
Or you can pm me if you like [I forget which topics I answer sometimes. I bounce around alot].
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92 Alltrac, 85 PU
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