Practice Quiz

Commercial Driver's License

Category - Class A

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When hooking up air supply lines between tractor and trailer, the air lines:
  1. Do not have to match according to color code.
  2. Should match, red to red, blue to blue.
  3. Should match red to blue, blue to red.
  4. The air lines are not color coded.
Explanation
Answer: B - When hooking up the air supply lines between the tractor and trailer, the air lines must match according to color. The red air hose must connect with the red gladhand and the blue air hose must connect with the blue gladhand. Mismatched air lines and gladhands will prevent the air brakes from functioning. Drivers must ensure that all connections are securely made before moving the vehicle.
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