What must be checked in the vehicle’s belt system during inspection?

During the inspection of a vehicle's belt system, it's crucial to check for signs of cracking, wear, or fraying. These indicators are critical because they can signify that a belt is nearing failure, which could lead to a breakdown or serious engine damage if not addressed. The primary function of a belt, such as the serpentine or timing belt, is to enable various engine components to operate properly. If these belts are worn or damaged, they may not function effectively, leading to issues such as a loss of power steering, overheating, or failure of accessory components.

Inspection for these signs helps ensure the safety and reliability of the vehicle. This is why properly assessing the condition of the belts is a fundamental aspect of the inspection process, focusing on signs of deterioration rather than merely aesthetic qualities like color or measurements. Thus, the emphasis on identifying physical defects that could lead to failure is what makes this answer correct.