Transferring the brake
pads’ resistance to motion to the wheels and on to the tires’ contact patches
are the brake discs or drums. Discs
are typically made from stainless steel, while drums are lined with cast iron.
Both materials provide a durable, heat-resistant surface for the brake pads to
press against. Modern brake discs are relieved, and or drilled, to assist in
cooling and to help shed water and debris
