Question 2 of 20
Score: 0/0When checking only the trailer service brakes, how should the air valves be set?
ExplanationTo properly test the trailer service brakes, both the service and parking brakes should be released, the trailer air supply should be pushed in (open), and the hand valve (trolley valve) should be used to apply the brakes.
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Did you know? Know which line is supply and which is service, and what happens when the emergency line loses air.
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