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The trailer hand valve:
A.  Should always be used for parking.
B.  Should only be used for parking on a downhill.
C.  Should never be used for parking.
D.  Should only be used when transporting cargo.
The trailer hand valve should not be used for parking. This could cause all of the air to leak out of the braking system, resulting in the brakes releasing. Instead, use the parking brake.
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