A new & old Magnet

Here you have a new & an old magnet. The top one being new, so the bottom one is the old one. Look at the holes in each one, see how the bottom one is worn; this did not stop it from working. What stopped it from working was the broken wire. The magnet drags on the brake drum at all times. When you press on the brake, current runs through the magnet; the magnetic force tries to stick on the drum. Rotation of the drum then pushes out the shoes to stop the rotation of the wheel.