If your asking about the 65-72 Kelsey Hayes, 4 piston caliper, disc brake system, you don't need to cut the studs, like you would need to do with DRUM brakes.
They just press out, separating the rotor, from the hub.
As another stated, a BFH works too, by putting the lug nut back onto the stud, flush with the threads, and whack away.
