Free Combination Vehicles Test - CDL Questions and Answers
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Combination Vehicles Test

Question #1 of 34

Go to the rear of the rig. Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping, showing the entire system is charged. Close the emergency line valve. Open the service line valve to check that service pressure goes through all the trailers (this test assumes that the trailer handbrake or the service brake pedal is on), then close the valve. If you do NOT hear air escaping from both lines, check that the shut-off valves on the trailer(s) and dolly(s) are in the OPEN position.


This is how can you test the tractor protection valve.

This is how can you test the trailer emergency brakes.

This is how can you test that air flows to all trailers.

This is how can you test the trailer service brakes.

This is not a test.








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