Reply to "brakes dragging"

Larry Stock at PPC Carson City does have rebuilts in stock, but there are a couple of other things you can check before ripping the calipers off & shipping them.
First, remove the wheels and get right up close, then have a friend step on the brakes hard while you WATCH the piston move and retract. If one does not, that one is sticking in its bore for some reason. I found one neglected Pantera that would not leak brake fluid when a rear bleed needle was REMOVED! I had to drill out the orifice below the needle seat which was full of corrosion & varnish.
A second thing is to disconnect the e-brake cable on each rear caliper and repeat the test. Cables have been known to freeze in their jackets from wear, rust or even badly applied undercoating. The e-brake's self-adjusting internal feature automatically tightens up the adjustment when you pull the lever. If the cables are sticky, this can hold the brake permanently 'on'. A loose or mangled under-car bellcrank (just in front of the engine, below the rear firewall) can also stick rear calipers.
But mainly, water in old brake fluid forms rust and varnish that will stick pistons front or rear, and which must be scrubbed off manually after disassembly- a messy, tedious but not impossible weekend chore. If the rears are sticky, I'd look really closely at the 8 front pistons, too.