Drum brakes are a type of braking system commonly used in vehicles. They consist of a cylindrical drum that rotates with the wheel and brake shoes that press against the inner surface of the drum to create friction. When the driver presses the brake pedal, hydraulic pressure forces the brake shoes outward, slowing down the vehicle. These brakes are known for their effectiveness in providing strong stopping power, especially in larger vehicles like trucks. However, they can be prone to overheating during prolonged use, which may lead to reduced performance. Regular maintenance is essential to ensure their reliability and safety.