What is the correct condition for air lines during inspection?

During a pre-trip inspection, it's crucial to ensure that the air lines are in optimal condition to prevent any potential failures while on the road. The correct condition for air lines is that they must not be frayed or rubbing on anything. This is essential because frayed air lines can lead to air leaks, which would affect the braking system's performance. Additionally, if air lines rub against other components or surfaces, they could become damaged over time, leading to hazardous situations, such as loss of braking ability.

Being vigilant about the condition of air lines sets a foundation for safety and reliability during operation. While some wear might be typical, particularly in high-use areas, any sign of significant wear, fraying, or contact with other objects is a serious concern and needs to be addressed promptly. In contrast, loose hanging lines can be an issue too, as they may not function correctly or could get caught in mechanical components. Overall, ensuring air lines are intact and unobstructed is a key part of maintaining operational safety and reliability for commercial vehicles.