Class B - Automatic transmission

Discussion in 'Questions From New Drivers' started by jmnp, Sep 10, 2025.

  1. jmnp

    jmnp Bobtail Member

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    New to the group. I had a question on the Class B parking brake test. Have a Class B truck with an automatic transmission. How do I test the parking brake without compounding the brake in order to shift from Neutral to Drive. Am I starting the truck, releasing the parking brake, then applying the foot brake in order to shift to drive, then pulling the parking brake with the truck in drive?
     
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  3. TripleSix

    TripleSix God of Roads

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    Question: does the Class B vehicle have air brakes or hydraulic?

    If it has air brakes, the parking brake will be spring activated, and you pushing in the valve on the dash releases this spring. Will have nothing to do with the service brakes (the foot brake).

    If the brakes on the class B truck are hydraulic, the parking brake will be a set of brake drums while the service brakes will be disc brakes. . Even so, two completely different systems. The only thing the parking brake does is prevent the vehicle from rolling when parked. The major concern is service brakes. You should not be using the parking brake at all with the vehicle in motion.
     
    Last edited: Sep 11, 2025
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  4. firemedic2816

    firemedic2816 Road Train Member

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    Chock your wheels throw it in neutral and get after it
     
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  5. OldeSkool

    OldeSkool Road Train Member

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    This sounds like my mom’s minivan.
     
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  6. Moosetek13

    Moosetek13 Road Train Member

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    How much foot brake pressure does it take to allow you to shift into drive?
    It is probably a switch on the brake pedal, so it would not be much. A quarter or half an inch?
    Barely anything for either air or hydraulic, so no compounding.

    I'm not familiar with that system, but I would think that setting the parking brake and then applying just enough pressure to the foot brake to allow you to shift into drive (then releasing the foot brake) would test it just fine.

    If you don't have a real teacher to guide you, maybe a little experimentation is in order?
     
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  7. WesternPlains

    WesternPlains Road Train Member

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    :laughing-guffaw::laughing-guffaw::laughing-guffaw:
    .
    Seriously....All Class B trucks are defective.
    You go to back one of those to a door.
    Looking in the mirrors.
    You turn the wheel.
    It goes the wrong way!
    Defective!
    Defective I tell ya!
    Defective!
     
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