Drum brakes are responsible for stopping the vehicle. Drum brakes are usually found on the rear wheels due to the need for a parking brake. Parking brakes are much easier to add to a drum brake than to a disc brake. Drum brakes contain different parts: brake shoes, which serve to press against the brake drum and create the friction necessary to stop the vehicle; a support plate that holds everything together and is fixed to the shaft; brake drum attached to the wheel; wheel or brake cylinder containing the pistons; return springs; and a self-adjusting system that will adjust the position of the pad when the brake is not inserted.
When the brakes are pressed, the brake fluid forces the pistons to press against the brake shoes that rest on the drum, which stops the wheel and the vehicle. When the brake is released, the return springs return the jaws to their original position. The brake shoes are very close to the drum, so when the brake pedal is pressed, the brakes are applied immediately. Over time, the surface of the jaws deteriorates and the position of the soles must be adjusted to avoid having to travel a greater distance to make contact with the drum. If the drum brakes did not have an automatic adjustment system, it is necessary to press the brake pedal further before applying the brakes.
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