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To ensure air is supplied to the second trailer on a combination vehicle, you must:
To ensure air is supplied to the second trailer on a combination vehicle, you must:
  • Apply the hand valve at 10 mph. Stop in the same distance as a truck with 1 trailer at 5 mph.
  • Get out and listen for air flowing through the supply lines.
  • Watch the air gauge for each trailer for a drop of 30 psi.
  • Go to the rear of the second trailer and open the emergency line shut off.