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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?
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 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.
  • The normal position is used for pulling a trailer. The emergency position is used to shut air off to the trailer.
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