I saw this post yesterday. Should have commented. I use two part epoxy for all brake pad or lining applications. If its a Cat brake, or something that is held in mechanically, I do not glue it. Otherwise, it's epoxy glue. It comes off of metal easily, is relatively heat resistant, and provides a solid bond, unlike RTV types that don't do any of that very well. They're made to hold fluids in, or out, not to bond.
I used JB Weld on the Powell brake liner. I found that the Model A restoration crowd uses it for their transmission bands. (Same application) It also comes off of metal surfaces pretty easy. It aint a weld after all. It's glue. Wire brush and it's gone.