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Combination air brakes practice quiz

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Combination air brakesQuestion 2 of 200
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What does the dash-mounted trailer air supply valve sense?

APushrod stroke at the tractor brakes
BWheel speed at the trailer axle
CAir pressure in the supply line leading to the trailerYour answerCorrect answer
Correct.

The trailer air supply valve senses supply-line pressure and directs air to the trailer system. (Guide p. 173)

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