Which shut off valves should be closed when preparing to tow?

Which shut off valves should be closed when preparing to tow?

• A. Close the service line
• B. Close the emergency line
• C. Open both valves
• D. Leave all valves alone

Answer: (B)

When preparing to tow, it is essential to close the emergency line shut-off valve. This is because the emergency line is designed to activate the brakes on the trailer in case of a failure in the service line. By closing this valve, you ensure that the trailer's brakes will not engage unexpectedly while towing. This can help prevent accidents or loss of control, particularly if the towed equipment were to become detached from the towing vehicle. In addition, closing the service line valve is not recommended in this situation as it may prevent proper functioning of the air brakes during the towing process. Opening both valves or leaving all valves alone would not adequately address safety concerns. Properly managing the emergency line is crucial for safe towing operations.

When preparing to tow, it is essential to close the emergency line shut-off valve. This is because the emergency line is designed to activate the brakes on the trailer in case of a failure in the service line. By closing this valve, you ensure that the trailer's brakes will not engage unexpectedly while towing. This can help prevent accidents or loss of control, particularly if the towed equipment were to become detached from the towing vehicle.

In addition, closing the service line valve is not recommended in this situation as it may prevent proper functioning of the air brakes during the towing process. Opening both valves or leaving all valves alone would not adequately address safety concerns. Properly managing the emergency line is crucial for safe towing operations.