Re: What is the purpose of the little nubs on the brake pads (2003 MGM)
They are there to prevent the piston from rotating.
Used mainly on rear brakes with a parking brake built in, but not always. The piston is screwed onto a coarse threaded rod. As the piston moves out the threaded rod rotates and keeps the piston and pad close to the rotor. If you know what I mean!