I guess I learn something new (almost) every day.
I've worked on cars pretty much since I can remember and never saw a set screw on any brakes I've done.
The closest I think I've seen were tapped holes in brake drums where you could screw in a bolt to push the drum off the hub. I can't remember what kind of car but I know those threads were usually so rusty no bolt would ever screw in and a sledge hammer worked better.
I've worked on cars pretty much since I can remember and never saw a set screw on any brakes I've done.
The closest I think I've seen were tapped holes in brake drums where you could screw in a bolt to push the drum off the hub. I can't remember what kind of car but I know those threads were usually so rusty no bolt would ever screw in and a sledge hammer worked better.