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A shut-off valve:
A.  Is located on the front of a trailer.
B.  Is located on the instrument panel.
C.  Prevents air from escaping an air brake system.
D.  Should always be open.
Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.

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