The bonding agent used to attach friction material to brake pads and shoes is a "thermo-setting cement". It's a liquid or paste that's applied to the mating parts, which are then clamped together and baked at about 400 degrees F. or so. The glue sets up solid as it's heated. Once it's cured, further heating short of red hot doesn't make it release. When I was stationed on Okinawa, I would watch the local parts rebuilders attach new brake linings onto old brake shoes. The shoes would be heated red hot with a torch, the remains of the old linings would be chiseled off, the shoes were cleaned up on a belt sander, and linings were applied, clamped on, and the assembly got baked in a furnace to bond the new linings. No problems with loss of brake material from those recycled parts! The lining material came on a big roll, and was cut to size to fit specific brake shoes.
Jerry
