Final answer:
Drum brake systems have several disadvantages, including overheating, reduced braking performance, and brake fade.
Step-by-step explanation:
Drum brake systems have several disadvantages. One disadvantage is that they can overheat easily, especially during prolonged braking or when descending steep hills. The heat generated can cause the brake fluid to boil, resulting in a loss of braking power. Another disadvantage is that drum brakes are generally less effective at dissipating heat compared to disc brakes, which can lead to reduced braking performance. Additionally, drum brakes are more prone to brake fade, which occurs when the brakes lose their effectiveness due to excessive heat buildup.