Which of the following indicates a brake drum is maximized beyond specifications?

The correct choice indicates that the diameter of the brake drum exceeds the maximum specifications set by the manufacturer. Brake drums are engineered with precise measurements to ensure optimal functioning of the vehicle's braking system. When a brake drum's diameter surpasses these specifications, it can lead to several issues, including reduced braking efficiency, increased stopping distances, and potential brake failure.

When a drum is smooth, not cracked, and within diameter specifications, it indicates that the brake drum is in acceptable condition. However, if the diameter is greater than the maximum specification, it signifies that the drum is out of tolerance and may compromise safety. This reasoning underlines the importance of adhering to manufacturer specifications to maintain safe and effective vehicle operation.