What is a potential consequence of excessive use of service brakes?

Answer: B — Expansion of the brake drums

The potential consequence of excessive use of service brakes is the expansion of the brake drums. When brakes are applied, friction is generated, which produces heat as a byproduct. If the service brakes are overused, the accumulated heat can cause the brake drums to expand. This expansion can lead to brake fade, reduced braking efficiency, and even potential damage to the braking system. Understanding this concept is crucial for maintaining the integrity of the braking system and ensuring safe driving practices. It also highlights the importance of managing braking techniques to prevent overheating and unnecessary wear on brake components, ultimately leading to better vehicle performance and safety on the road.