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No less than 30 psi

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Q: What PSI should the trailer Air Supply control valve close?
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How close can the trailer be to the truck?

What truck.


When turning right at an intersection you should be within how many feet from the curb?

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What time does tractor supply close on Sunday?

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Which shut off valves should be open and which closed on a 18 wheeler?

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Which shut-off valves should be open and which closed on a 18 wheeler?

Page 6-11 2005 Commercial Driver's License Manual6.5.2 - Combination Vehicle Brake CheckDo these checks in addition to Section 5.3: Inspecting Air Brake Systems.The following section explains how to check air brakes on combination vehicles. Check the brakes on a double or triple trailer as you would any combination vehicle.Check That Air Flows to All Trailers. Use the tractor parking brake and/or chock the wheels to hold the vehicle. Wait for air pressure to reach normal, then push in the red "trailer air supply" knob. This will supply air to the emergency (supply) lines. Use the trailer handbrake to provide air to the service line. Go to the rear of the rig. Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping, showing the entire system is charged. Close the emergency line valve. Open the service line valve to check that service pressure goes through all the trailers (this test assumes that the trailer handbrake or the service brake pedal is on), and then close the valve. If you do NOT hear air escaping from both lines, check that the shut-off valves on the trailer(s) and dolly(ies) are in the OPEN position. You MUST have air all the way to the back for all the brakes to work.


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