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Question
The trailer hand valve should be used:
Answers
A.  To test the trailer brakes.
B.  To check the connection between the trailer and tractor.
C.  To accelerate.
D.  To test the lights on the trailer.
Explanation
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes.
Answer Statistics
30.78 % of our users get this question wrong.
This questions is considered quite Hard

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