Practice question

What is the tested combination-vehicle principle for service and emergency air lines?

Cross service and emergency lines if the colors match
Leave glad hands dirty or uncapped when stored
The service line carries normal brake control, while the emergency or supply line charges trailer tanks.
Let lines drag or stretch during turns

Answer: C — The service line carries normal brake control, while the emergency or supply line charges trailer tanks.

The correct answer is shown above. Try the full quiz for additional practice.