Kelsey Hayes 4 piston calipers help

The ones I have taken apart the chrome on the pistons have been bad. That's one reason there so hard to get apart. I second just buying a rebuilt if you can find them. I like the stainless piston rebuilt caliper but they are pricey.

I have a couple sets of cores laying around I'm going to try that grease pumping them out. I've done the air trick and it's not really that safe even with rags wrapped around everything.:D