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You are driving a combination vehicle when the trailer brakes away, pulling apart both air lines. You would expect the trailer brakes to come on and:
You are driving a combination vehicle when the trailer brakes away, pulling apart both air lines. You would expect the trailer brakes to come on and:
  • The trailer supply valve to stay open.
  • The tractor to lose all of its air pressure.
  • The tractor protection valve to close.
  • The tractor protection valve to open.