Prior to performing a brake test, make certain that:

Prior to performing a brake test, make certain that:

• A. Air hoses are in serviceable condition and properly coupled. Angle cocks, end cocks, and cutout cocks are properly positioned.
• B. The locomotive is in gear and the air brakes are released.
• C. The train is on the main line and the signal is green.
• D. The air compressor has been serviced within the last hour.

Answer: (A)

Before performing a brake test, the most important check is that the air brake system can be charged and operated without leaks or misconnections. The air hoses must be in good condition and properly coupled so air can flow freely through the brake pipe to every car. If a hose is damaged or not seated correctly, air will escape or be blocked, and the test results won’t reflect how the system will behave in service. Equally critical is having the proper positions on the isolation and cutout valves—angle cocks, end cocks, and cutout cocks. These valves control which parts of the train are pressurized and how air flows during charging and testing. If any valve is mispositioned, segments of the train can be isolated or not properly connected, leading to false readings or unintended braking during the test. Other options don’t address the immediate readiness of the brake system: being in gear or on a main line isn’t required for the test itself, and whether the compressor was serviced within the last hour doesn’t affect the test readiness. The test relies on a sound, fully connected air system and correctly positioned valves.

Before performing a brake test, the most important check is that the air brake system can be charged and operated without leaks or misconnections. The air hoses must be in good condition and properly coupled so air can flow freely through the brake pipe to every car. If a hose is damaged or not seated correctly, air will escape or be blocked, and the test results won’t reflect how the system will behave in service.

Equally critical is having the proper positions on the isolation and cutout valves—angle cocks, end cocks, and cutout cocks. These valves control which parts of the train are pressurized and how air flows during charging and testing. If any valve is mispositioned, segments of the train can be isolated or not properly connected, leading to false readings or unintended braking during the test.

Other options don’t address the immediate readiness of the brake system: being in gear or on a main line isn’t required for the test itself, and whether the compressor was serviced within the last hour doesn’t affect the test readiness. The test relies on a sound, fully connected air system and correctly positioned valves.