4 Point Airbrake Check

Topic 104 | Page 1

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Pebbles (Juelma N)'s Comment
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This is the way I learned it in Indiana, but its basically the same for everyone. I figured it will help me remember it, and maybe help out another newbie. So here we go. This is by memory.

I will begin my 4 point air brake check at or below 90 psi. With my engin running I will let air pressure and check that the air compressor govenor has cut out between a 100-140 psi. I will know this by a burst of air from my air dryer. Since I have no wheel chocks I will put my truck in a low gear turn my engin off and key to on position so my gages will work. I will push in both my brake valves and let air stablize. I will then push and hold my foot brake and watch for an air pressure drop no more than 3 psi in a min for a single vehicle and no more than 4 psi for a combination unit with air equipt trailer. 1/1000 2/1000 3/1000 okay. I will begin to fan off air pressure down to approximately 60 psi and look and listen for my low airpressure warning alarm and light to activate. I will continue to fan off airpressure down to approximately 20-45 psi and look and listen for my valves to pop out. And this concludes my 4 point airbrake check.

Pebbles (Juelma N)'s Comment
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I forgot to tell you how I fan off airpressure by using my foot brake.

Steve B.'s Comment
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The only thing I would add is restarting engine, putting the truck into gear and trying to pull forward - this shows that the brakes did indeed engage and the truck/trailer is not moving.

Pebbles (Juelma N)'s Comment
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Yea tug test is good. I just didnt say it becouse they put that as incab inspection. The incab was seperate from 4 point.

Pebbles (Juelma N)'s Comment
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When we tested we had outside pretrip, then incab which tug test was the last thing. Then we would say this conludes my incab portion of the pretrip. Than we would go on to 4point.

David's Comment
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Found this on our site here... It follows what you had said in your first post, Figured it may help you if you want to make sure you got it right.

In Cab Brake test

Justin B.'s Comment
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My school had us test the brakes before this procedure so you don't have to wait for the pressure to build back up to resume testing. But this sounds exactly like what I just did, maybe just worded differently, but I'm not gonna say how. That's the last thing you would need. Just stick to how the school is teaching you for now, and it sounds like you're doing great!

Pebbles (Juelma N)'s Comment
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Thanks Justin!! Maybe soon I can do it again. I probably.have to learn new words, but it will still be the same concept just like with you!!

Special K, aka Kathy's Comment
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That is very helpful, I am more concerned about the pre trip test than the road test! I know I can do it (had to do pre trip for school bus) there is just a lot more on a rig to remember! I hope to be starting with Central next month!

Eric S.'s Comment
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Quick question. I am going Wednesday for my CDL B road test and air brake test. What wheels do you chock for the air brake test in TX or does it matter. I just want to make sure I get it right. Thanks!

CDL:

Commercial Driver's License (CDL)

A CDL is required to drive any of the following vehicles:

  • Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
  • Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
  • Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
  • Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
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