Drum brakes work pretty much like disc brakes do. Essentially, they are shoes pressing against the surface while it spins. In a system like this one, that surface would be called the drum. In many cases, a vehicle will have disc brakes on the front wheels, and the drum brakes will only be on the rear wheels. One of the main factors that differentiate the drums from the discs is that drum brakes have quite a few more parts involved than disc brakes do, which is why there are so many options to choose from when it comes to drum brake parts.
Another factor to remember is that drum brake parts are more difficult to service. Even though they are beneficial to your vehicle, servicing them is a lot more complicated, which essentially means they are more expensive to maintain. Although drum brake parts are more expensive, they are worth the cost as they can offer emergency brake mechanisms that come in handy.
What is also helpful is the fact that, if you need to replace the drums or discs on your brakes, you could look at buying the kits to do the replacement yourself. It’s no problem getting the drum brake parts, if you know what to do with them.