Stop in for a cup of coffee
If you've got Bendix 4 piston calipers the core charge is high because they are rare. Use yours if they aren't ruined. See if someone makes stainless steel pistons or brass sleeve them if need be. Then bleed the brakes every Spring.
It depends on what's wrong and what caliper. I've never managed to get the K-H fixed caliper piston's back in. A couple of guys here have it down pat, but I've tried several times and no go. Another issue now with those is the chroming on the pistons has been shoddy in recent years.
If you've got Bendix 4 piston calipers the core charge is high because they are rare. Use yours if they aren't ruined. See if someone makes stainless steel pistons or brass sleeve them if need be. Then bleed the brakes every Spring.
That's the way it went on the Wagoneer's sliding calipers. Fortunately there was still a local parts store close by. They had a Cardone rebuild waiting for me when I got there. Fugly looking but they worked.
Crack them with the best fitting wrench you've got. I'll sometimes use a 6 sided socket. After that can use an open end or box wrench.
Advance is now combined with Carquest. Not sure if that will increase your odds but it might. You need a real parts store. One with at least couple warehouses they can get stuff from. I know. They've become rare.
Yup. I'd say thats his problem to solve.