Rebuilding Kelsey Hayes Calipers

I also use a silicon grease on all rubber parts, and after thoroughly cleaning out those receiver grooves, I put it in there too.The grease I use is the stuff that comes with every RoadRanger transmission overhaul kit.I rebuilt hundreds of those things,back in the late 70s, and still have tubes left over.
I use DOT5 only in the KH system.This system runs a pretty tight piston to bore clearance, and does not tolerate moisture. Mine have been trouble-free for 15plus years.