What condition should the valve stem and cap be in during a pre-trip inspection?

During a pre-trip inspection, ensuring that the valve stem and cap are made of metal and properly secured is critical for safe vehicle operation. Metal valve stems are preferred because they are generally more durable than plastic and less likely to become brittle or crack over time. A secured valve cap is essential to prevent air from escaping, which can lead to tire under-inflation and subsequent tire failure. Proper condition and securement of these components contribute to maintaining optimal tire pressure, enhancing vehicle safety and performance on the road.

In contrast, plastic valve stems can be more susceptible to damage, and potential leaks could compromise tire pressure. Worn down or cracked valve stems can lead to air loss, increasing the risk of tire-related issues. Options that imply deterioration or improper materials do not support the requirements for safe operation and would not be acceptable during a pre-trip inspection.