Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Cast-iron drum which is part of the braking system. The inside of the drum is machined to an accurate finish and the brake shoes, bearing against this surface, retard the speed of the car. The brake drum may also carry the road wheel. Drum brakes are nearly always confined to the rear wheels, disc brakes being used at the front on most cars manufactured today.