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Air pressure reading??

Discussion in 'Trucking Schools and CDL Training Forum' started by ayaytc, Jun 15, 2022.

  1. Jun 15, 2022 #1
    ayaytc

    ayaytc Bobtail Member

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    Hi all.

    I’m studying for my air brake test and there’s one nagging detail I can’t figure out: during my 60 second air leak test, how on Earth am I supposed to measure 2 or 3 or 4 PSI on this thing??
     

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    ayaytc, Jun 15, 2022
    ayaytc, Jun 15, 2022
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  3. Jun 15, 2022 #2
    Judge

    Judge Road Train Member

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    Just make sure the needle doesn’t move, much after you apply brakes and it settles down, be sure to apply constant pressure, more on peddle takes more air.
     
    Judge, Jun 15, 2022
    Judge, Jun 15, 2022
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    AModelCat and tscottme Thank this.
  4. Jun 19, 2022 #3
    tscottme

    tscottme Road Train Member

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    You just have to recognize if the air pressure drops MORE than 2-4 PSI. The PSI is a well-maintained truck will show NO PSI drop. You are looking for NO drop, in most cases. If the truck has an air leak then the law allows the air leak if it doesn't exceed the 2-4 PSI allowance.
     
    tscottme, Jun 19, 2022
    tscottme, Jun 19, 2022
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    AModelCat Thanks this.
  5. Jun 19, 2022 #4
    bavarian

    bavarian Heavy Load Member

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    You nailed it.
    Put the foot on the pedal, wait until everything has settled then start the clock. No further movement should happen after that.
     
    bavarian, Jun 19, 2022
    bavarian, Jun 19, 2022
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