Had my 10 year old son take some practice CDL tests

Discussion in 'Ask An Owner Operator' started by Mattflat362, May 8, 2021.

  1. Mattflat362

    Mattflat362 Road Train Member

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    right here on TTR and then on one other site. Which one is misinformation? I actually forget and google even brings up both numbers with no clear answer. Nothing like wasting time at a real testing center with bad information!

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  3. Grumppy

    Grumppy Trucker Forum STAFF Staff Member

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    I cant give you a positive answer but I've always known it to be 3 psi... period, whether straight truck or TT.

    AFAIK, if DOT has you to do a air brake air leak test, it cant loose more than 3 psi... no matter the vehicle. Again, I cant give you a guarantee on that but that's what I always understood.
     
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  4. Judge

    Judge Road Train Member

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    Yep, agree 3 lb per minute for combination vehicle.
    Less than 2 for single vehicle.
     
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  5. AModelCat

    AModelCat Road Train Member

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    I had to look it up. From what I read in the BC manual it looks like 3 PSI per minute with a full brake application for a straight truck. 6 PSI per minute with a full application for a truck and 2 trailers.

    Couldn't find anything pertaining to a single trailer unit or anything for just a truck sitting with the park brakes on and no service brake application.
     
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  6. Judge

    Judge Road Train Member

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    I looked it up, some stayed say 2 psi for straight truck, some say 3.
    Stop at scale and ask DoT officer in your state,

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  7. Rideandrepair

    Rideandrepair Road Train Member

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  8. AModelCat

    AModelCat Road Train Member

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    Must be subjective based on one's State/Province.
     
  9. Rideandrepair

    Rideandrepair Road Train Member

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    That’s from Rhode Island, but it’s Federal Rule.
     
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  10. Judge

    Judge Road Train Member

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    I guess whichever cdl book the state gives has that answer, that way they know you read the book, 1 psi per minute one way or other won’t make a difference with the engine off
     
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  11. Cattleman84

    Cattleman84 Road Train Member

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    In the CDL manuals for Idaho it states 4 psi... Or at least it did about 8 years ago.
     
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