brake pad 
noun
A thin block, typically one of a pair, which presses on to the disc in a disc brake.The brake system includes a brake drum, a brake shoe, a brake pad, and a position sensor....
- To fight a skipping brake, make sure you increase the pressure on the brake pad very gradually.
- Midway through the Wednesday ride the ‘thump, thump, thump’ of the rubbing brake pad gets considerably worse.