Good luck! What is a big disadvantage of the drum brake? The brake lining must be at the right temperature to function well. A drum brake requires more brake force. A drum brake is difficult to operate. The heat generated in a drum brake cannot easily escape.

The correct answer is: The heat generated in a drum brake cannot easily escape.<br /><br />Explanation: Drum brakes are known for generating a significant amount of heat during braking due to the friction between the brake shoes and the drum. This heat can cause several issues, such as brake fade under heavy use, reduced braking efficiency, and potential damage to the brake components. The design of drum brakes does not allow for efficient dissipation of this heat, making it a significant disadvantage compared to other braking systems like disc brakes, which are better at managing and dissipating heat.