Air Vs. Hydraulic Braking

Discussion in 'Questions From New Drivers' started by TheShadow, Aug 27, 2012.

  1. Aug 27, 2012 #1
    TheShadow

    TheShadow Light Load Member

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    Here's one for all of you diehard gear jammers:

    What percentage of tractor-trailers on the roads today have air brakes? What percentage have hydraulic brakes? What percentage have both? I have a CDL permit test fast approaching and I would like to get a better understanding of both air and hydraulic braking.

    Thanks.:biggrin_25520::biggrin_2556::biggrin_2552:
     
    TheShadow, Aug 27, 2012
    TheShadow, Aug 27, 2012
    #1
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  3. Aug 27, 2012 #2
    stabob

    stabob Heavy Load Member

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    You have a lot to learn
     
    stabob, Aug 27, 2012
    stabob, Aug 27, 2012
    #2
  4. Aug 27, 2012 #3
    TheShadow

    TheShadow Light Load Member

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    Thanks Bob. Hope the Florida weather doesn't slow you down lately. I hear you should avoid the Louisiana Coast tomorrow. Regardless, I do know that hydraulics are cheaper because they leak. I also know that newer trucks are built with air brakes. What percentage of trucks have both Bob?
     
    TheShadow, Aug 27, 2012
    TheShadow, Aug 27, 2012
    #3
  5. Aug 27, 2012 #4
    IceCreator

    IceCreator Medium Load Member

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    IceCreator, Aug 27, 2012
    IceCreator, Aug 27, 2012
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  7. Aug 27, 2012 #5
    Bikerboy

    Bikerboy Light Load Member

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    Probly 99% of tractor trailers have air brakes, hydraulic brakes are only used on light duty single axle trucks normally. I have seen pintle hitch trailers with hydraulic surge brakes or electric. Or light duty trucks and trailer will have hyrdaulic on the truck and electric on the trailer.
     
    Bikerboy, Aug 27, 2012
    Bikerboy, Aug 27, 2012
    #5
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  8. Aug 27, 2012 #6
    rwdfinch50

    rwdfinch50 Medium Load Member

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    I don't know of any tractor trailers with Hydraulic brakes. That's why he said what he did. Unless it's something special, all tractor trailers have air brakes, therefor, the need for an "air brake" test on your cdl.
     
    rwdfinch50, Aug 27, 2012
    rwdfinch50, Aug 27, 2012
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  9. Aug 27, 2012 #7
    TheShadow

    TheShadow Light Load Member

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    Thanks guys. Allow me to explain: The DMV CDL manual I have lists the procedure for testing hydraulic brakes at least twice. I would guess this is in case one ends up in a light truck.

    Thanks again.
     
    TheShadow, Aug 27, 2012
    TheShadow, Aug 27, 2012
    #7
  10. Aug 27, 2012 #8
    IceCreator

    IceCreator Medium Load Member

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    Like a 1 ton and dual tandem hot shot trailer
     
    IceCreator, Aug 27, 2012
    IceCreator, Aug 27, 2012
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  11. Aug 27, 2012 #9
    turnanburn

    turnanburn Medium Load Member

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    Your CDL manual contains a good amount of outdated material.
     
    turnanburn, Aug 27, 2012
    turnanburn, Aug 27, 2012
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  12. Aug 27, 2012 #10
    dptrucker

    dptrucker Road Train Member

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    yeah..but your cdl test will pertain to air brakes.
     
    dptrucker, Aug 27, 2012
    dptrucker, Aug 27, 2012
    #10
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