Automotive suspension control arms are the components that connect a car's suspension to the chassis. Although automotive suspension control arms come in many shapes and sizes, they are easy to identify or spot. They are visible metal structures that extend from the body to the wheel assembly.

A wheel end brake drum is a cylindrical drum that is attached top the inside of a car’s wheel, and so rotates at the same speed as the wheel. The drum surrounds a set of brake shoes that are coated in materials that generate friction.