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Question
The trailer hand valve:
Answers
A.  Should always be used for parking.
B.  Should only be used for parking on a downgrade.
C.  Should never be used for parking.
Explanation
Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place. Instead, use the parking brake or wheel chocks.
Answer Statistics
35.24 % of our users get this question wrong.
This questions is considered quite Hard

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