You notice the air pressure drops unusually fast after building it up on a doubles combination. What is a likely cause?

Pick an answer

1. This is expected behavior on any doubles combination and needs no attention
2. A leak somewhere in the air lines or connections feeding one of the trailers
3. The combination has too many trailers for the air system to handle, which is normal
4. The tractor's fuel tank is running low

Correct!

Not quite. The correct answer is highlighted.