drive through car wash equipment
Animation effectively illustrates this process, showing how the rotation of the drum causes it to spin while the shoes are forced outward. This outward movement occurs due to the expansion of the brake shoes, driven by the movement of the pistons. The friction generated between the shoes and the drum produces the braking force needed to slow down or stop the vehicle.
how drum brakes work animation

One standard method for measuring brake drums involves utilizing a brake drum measurement chart, which provides specific dimensions and tolerances relevant to different vehicles. Typically, this chart includes measurements such as the inner diameter of the drum, the total thickness, and necessary tolerances for both new and worn drums. By referencing this chart, technicians can determine if the brake drum is still within acceptable limits or if it requires immediate attention.
brake drum measurement chart
