What should the condition of the connections for the air line to the brake chamber be?

The correct answer highlights the importance of ensuring that the connections for the air line to the brake chamber are tight on both ends. Properly secured connections are crucial for the safe and reliable operation of the braking system. A loose connection could result in air leaks, leading to diminished braking power and increased stopping distances, which could jeopardize safety on the road. Additionally, a secure fit prevents the lines from disconnecting, especially during operation or under vibration, ensuring that the braking system functions effectively.

The other options present scenarios that compromise safety and functionality. Loose and disconnected fittings could lead to air loss, causing brakes to fail. Checking only one end might miss critical issues at the other end, while allowing frayed connections could lead to leaks, again compromising the braking system's effectiveness. Understanding the necessity for tight, secure connections is a key aspect of performing a thorough pre-trip inspection.