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Question
If a truck is equipped, a trailer brake hand valve can be used to:
Answers
A.  Add fuel to the vehicle.
B.  Prevent the vehicle from rolling back when being started from a stop.
C.  Check the oil level.
D.  Load cargo.
Explanation
If a tractor-trailer is so equipped, the trailer brake hand valve can be used to stop the vehicle from rolling back when being started from a stop.
Answer Statistics
7.47 % of our users get this question wrong.
This question's difficulty is Medium

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