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On older vehicles there may be a lever, rather than a knob, for the tractor protection valve. What are the normal and emergency positions?
The normal position is used for pulling a trailer. The emergency position is used to shut air off to the trailer.
The normal position is horizontal. The emergency position is vertical.
The normal position is used for supplying air to the drive wheel brakes. The emergency position is used to substitute for the emergency brakes.
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On older vehicles there may be a lever, rather than a knob, for the tractor protection valve. What a...