What is one advantage of disc brakes over drum brakes?

• A. Lower cost of production
• B. Better heat dissipation and performance in wet conditions
• C. Reduced weight
• D. Longer lifespan

Answer: (B)

The advantage of disc brakes over drum brakes primarily lies in their better heat dissipation and performance in wet conditions. Disc brakes are designed with an exposed rotor that allows for efficient cooling as air flows over the surface during operation. This cooling capability helps maintain consistent braking performance, especially during prolonged use, such as in high-speed driving or when frequent braking is required, reducing the risk of brake fade.

In wet conditions, disc brakes also perform better because the exposed rotor can shed water more effectively than the enclosed design of drum brakes, which can trap water and create a layer of moisture that reduces friction. This results in more reliable stopping power when the brakes are applied, regardless of the weather conditions.

The other options do not highlight the core benefits of disc brakes as effectively. For instance, while disc brakes can sometimes be heavier than equivalent drum brakes, the structural design can also facilitate efficiency and performance enhancements that may outweigh the weight considerations.