Installing Kelsey Hayes Caliper Pistons ?

I use a silicone grease that I get from the Fuller transmission people, the outfit that brought us the 13 speed RoadRanger hiway tractor transmissions. And the 15s and the 18s and I heard recently 21s. I spent several years rebuilding those and I always got a tube of the grease with every kit. I had so many I couldn't get rid of them fast enough. Many of them ended up in my toolbox and here I am,33 years later still with a bit left. Thatchit is super slippery. Just a tiny bit goes a long long way.
When I am done I can spin the pistons in the bores using a snap-ring plier. It has to be this way because the only thing that releases the brakes is seal-retraction. So if the pistons are tight, she will burn the pads up. But if the seals are too slippery they may not retract the pistons either. To combat this I set my wheel bearings a tiny bit loose and let the rotors slap the pistons around, just a tiny bit. Works like a charm.