What provides the friction surface necessary to stop wheel?

The brake pad provides the friction surface necessary to stop the wheel. The brake pad is a composite material made of various metals, fibres, and other additives. It is designed to withstand the high temperatures and friction generated during braking. When the brake pedal is applied, the brake pads are forced against the brake disc or drum, which in turn slows down the wheel. The friction between the brake pads and the disc or drum creates heat, which is dissipated through the brake system.