During brake inspections, what condition should the drum not exhibit?

The condition that the brake drum should not exhibit is the presence of cracks, dents, or holes. Damage like this can significantly impair the drum's ability to function properly. Cracks can lead to further structural failure, dents may interfere with the drum's ability to maintain even braking, and holes can allow contaminants to enter the braking system, potentially leading to brake failure or decreased performance. Ensuring that drums are free from such severe defects is crucial for the overall safety and reliability of the vehicle's braking system.

In contrast, loose bolts may indicate a need for tightening or replacement but are not as critical as the structural integrity of the drum. Minor scratches typically do not affect performance significantly as long as they are not deep or extensive. Minor surface rust can be acceptable in most cases, as it usually does not compromise the function of the brake drum unless it is severe or widespread. Therefore, the most detrimental condition for a drum is indeed the presence of cracks, dents, or holes.