DEF Is Related To Brake System

Topic 24929 | Page 1

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David T.'s Comment
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Hi, I'm a CDL student and I know some mechanical about trucks. I have a fellow student who said that the DEF prevent the air tanks form freezing, another said it's an additive. I Google for hours and I know both are incorrect but I didn't found anything that said in Black and White DEF is no related to brakes. I found and article that said it's not an additive. Can someone help me with knowledge. 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.
G-Town's Comment
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David T.'s Comment
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Thanks for the picture and the article, but if you read my post I already know all that.

Tractor Man's Comment
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DEF is injected into the exhaust system of diesel engines to reduce Nitrogen Oxide emissions. It has nothing to do with the Air Brake System. Welcome to the Forum David. Stick around, you will learn a lot here. It will put you heads and tails ahead of your fellow students. Where are you attending Driving School?

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Jamie's Comment
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I never heard anything about it being related to the brakes or keeping the air tanks from freezing. It's simply used to help the exhaust trucks usually let out be more "environmental friendly".

You would prevent your air lines or tanks from freezing simply by emptying the air tanks so it pushes out any water and oil that might be built up.

Jamie's Comment
member avatar

DEF is injected into the exhaust system of diesel engines to reduce Nitrogen Oxide emissions. It has nothing to do with the Air Brake System. Welcome to the Forum David. Stick around, you will learn a lot here. It will put you heads and tails ahead of your fellow students. Where are you attending Driving School?

good-luck.gif

Beat me to it with a better answer too. rofl-3.gif

David T.'s Comment
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Thanks for the respond, I been reading articles about DEF and I never found anything related to brakes, but I want it to all the expert on the field. I attend to Ferrari driving school in Astoria Queens, New York. Because it's a grant I need to complete class B to get class A, but it's ok, or maybe I find a company who help me get the class A and don't need to deal with some circumstances here.

Tractor Man's Comment
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Thanks for the picture and the article, but if you read my post I already know all that.

Wow! No need to get snappy David. If you "already know all of that", why did you post the question? This is a great group of people willing to answer any and all questions from newbies. We are not confrontational here.

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Tractor Man's Comment
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Because it's a grant I need to complete class B to get class A, but it's ok, or maybe I find a company who help me get the class A and don't need to deal with some circumstances here.

You really should look into Company Sponsored Training. I have NEVER heard of needing a Class B in order to get an A. Sounds suspiciously like a money grab on the part of the School recieving the Grant Money. Search Company Sponsored Training on this site.

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Company Sponsored Training:

A Company-Sponsored Training Program is a school that is owned and operated by a trucking company.

The schooling often requires little or no money up front. Instead of paying up-front tuition you will sign an agreement to work for the company for a specified amount of time after graduation, usually around a year, at a slightly lower rate of pay in order to pay for the training.

If you choose to quit working for the company before your year is up, they will normally require you to pay back a prorated amount of money for the schooling. The amount you pay back will be comparable to what you would have paid if you went to an independently owned school.

Company-sponsored training can be an excellent way to get your career underway if you can't afford the tuition up front for private schooling.

Jamie's Comment
member avatar

Paid CDL Training Programs is usually the recommended path here on TT, and it works for most people. But a lot of companies will hire people and train them for free while all you have to do is usually sign a contract saying you'll work for them for one year.

Some of them even pay you while you're getting your CDL or let you take out advances that'll be paid back over time.

I went with Schneider and although they don't have their own school anymore they paid for me to attend school to get my CDL before going to Schneider for a few more weeks of training. The only thing I bad to pay for was gas during school and food, they paid for the school and lodging costs.

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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