1. Friction: When you press the brake pedal, the brake pads or shoes inside the drum press against the inner surface of the drum, creating friction. This friction generates heat, which can cause the drum to become hot.
2. Lack of Ventilation: Brake drums are often not as well-ventilated as disc brakes. This can cause heat to build up inside the drum, leading to overheating.
3. Glazed Brake Pads/Shoes: If the brake pads or shoes become glazed, they will not be able to grip the drum effectively. This can cause increased slipping, which generates more heat.
4. Seized Caliper/Wheel Cylinder: If the caliper or wheel cylinder (the device that actuates the brake pads or shoes) becomes seized, it can prevent the pads or shoes from retracting properly. This can cause constant friction, which leads to overheating.
5. Dragging Brakes: If the brakes are dragging, meaning they are not fully releasing after being applied, it can cause the brake drums to overheat. This can be caused by a variety of issues, such as worn or damaged brake components, or a problem with the brake fluid.
6. Heavy Loads or Frequent Braking: Driving with heavy loads or frequently using the brakes, such as in mountainous areas or heavy traffic, can put extra strain on the brakes, causing them to run hot.
It's important to address any issues that cause the brake drums to run hot as soon as possible to prevent further damage to the brakes or other components of the vehicle.
