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5 Cards in this Set
- Front
- Back
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Which shut off valves should be open and which closed? |
Close the emergency line valve. Open the service line valve to check that service pressure goes through all the trailers. |
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How can you test that air flows through all trailers? |
Use the tractor parking break 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 lines. Use the trailer handbrake to provide air to the service line. Go to the rear of the rig. Open the last emergency line shut off valve at the Rear of the last trailer. You should hear air escaping, showing the entire system is charged. |
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How can you test the tractor protection valve's? |
Charge the trailer air brake system. Shut the engine off. Step on and off the brake pedal several times to reduce the air pressure in the tanks. The trailer air supply control should pop out, go from normal to emergency positions when the air pressure falls into the pressure range specified by the manufacture. |
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How can you test the trailer emergency brakes? |
Charge the trailer air brake system and check that the trailer rolls freely. Then stop and pull out the trailer air supply control (also called tractor protection valve control or trailer emergency valve), or place it in the emergency position. Pull gently on the trailer with the tractor to check that the trailer emergency brakes are on. |
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How can you test the trailer service brakes? |
Check for normal air pressure, release the parking break, move the vehicle forward slowly, and apply trailer brakes with the hand control (trolley valve), if so equipped. |
