True or False: Drum brakes are more efficient than disc brakes in dissipating heat.

• A. True
• B. False
• C. Depends on the vehicle
• D. Only when new

Answer: (B)

Drum brakes are generally considered less efficient than disc brakes in dissipating heat. This is primarily due to the design of drum brakes, which encase the braking components within a drum, limiting airflow around the brake surfaces. This confinement can cause heat to build up more quickly, leading to a potential decrease in braking performance, especially during prolonged or heavy braking situations.

In contrast, disc brakes feature an open design that allows better airflow, promoting more efficient heat dissipation. The larger surface area of disc brakes and their inherent design also help in better heat management. As a result, when considering the efficiency of heat dissipation, disc brakes typically outperform drum brakes, making the assertion in the question that drum brakes are more efficient in this regard inaccurate.