Practice question

For a Maryland Class A combination service and emergency air lines?

Let lines drag or stretch during turns
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.

Answer: D — 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.