Which of the following is a crucial aspect of regular truck maintenance?

The selection highlights the importance of inspecting tires, brakes, and fluid levels as a crucial aspect of regular truck maintenance. These components are vital for the safe and efficient operation of any vehicle, particularly in heavy-duty trucks.

Tires must be routinely checked for proper inflation, tread wear, and overall condition, as they directly impact traction, fuel efficiency, and safety. Brakes are critical for stopping the vehicle safely; checking them for wear and ensuring the brake fluid is at appropriate levels can prevent accidents. Fluid levels, including oil, coolant, transmission fluid, and brake fluid, need regular monitoring as low levels can lead to mechanical failure and costly repairs.

In contrast, while checking the exterior for scratches and replacing windshield wipers are beneficial for maintaining the aesthetics and visibility of the truck, they do not address the core mechanical and safety concerns that can arise from neglecting critical components like the tires, brakes, and fluids. Additionally, focusing on comfort items like the radio and cabin comfort does not contribute to the vehicle's operational integrity or safety. Overall, maintaining these crucial mechanical elements is essential for ensuring the truck operates safely and efficiently over time.