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Combination Vehicles Test

Combination Question #1 of 19

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Charge the trailer air brake system and check that the trailer rolls freely. Then stop and pull out the trailer air supply control valve. Pull gently on the trailer with the tractor to check that the trailer emergency brakes are on.


This is no way to test anything

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

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