Wiktionary
brake pad
n. A friction element in a disc brake.
Wikipedia
Brake pad
Brake pads are a component of disc brakes used in automotive and other applications. Brake pads are steel backing plates with friction material bound to the surface that faces the disc brake rotor.
Usage examples of "brake pad".
Pressing his forearms to the slick metallic surface, he tries desperately to slow his descent, using the neoprene wet suit as a brake pad.