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A question I have never seen asked before about setting brakes

Discussion in 'Questions From New Drivers' started by NewNashGuy, Jul 9, 2014.

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  1. Jul 9, 2014 #1
    NewNashGuy

    NewNashGuy Road Train Member

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    I have always wanted to ask this but always forgotten until now. OK, when I pull up to get fuel and set my brakes, I noticed that if I push in the brake pedal while pulling the air knobs, my truck does a quick and quiet "pshhh" air sound. However if I pull up and just pull the knobs without using the brake pedal, it does the longer and louder "PSSSSSSSSSHHHHHHHHH" sound. So I wonder if it hurts anything to press in the brake pedal while releasing your air brakes? If not, how come other drivers don't do it? Because a lot of them pull up while I am fueling and it hurts my ears sometimes when they release their brakes and they make the long high pitched sound.
     
    NewNashGuy, Jul 9, 2014
    NewNashGuy, Jul 9, 2014
    #1
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  3. Jul 9, 2014 #2
    CondoCruiser

    CondoCruiser The Legend

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    Take your foot off the brake. It's recommended you don't touch the brake pedal with your parking brake activated. Some of the newer trucks have a safety bypass valve to remedy the situation but how do you know if you have it or not.

    From the manual....


     
    CondoCruiser, Jul 9, 2014
    CondoCruiser, Jul 9, 2014
    #2
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  4. Jul 9, 2014 #3
    NewNashGuy

    NewNashGuy Road Train Member

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    Thanks. I have been doing this for years without a problem so my truck must have a bypass. I will try not to do so now if it could potential cause damage.
     
    NewNashGuy, Jul 9, 2014
    NewNashGuy, Jul 9, 2014
    #3
  5. Jul 9, 2014 #4
    Jrivas23

    Jrivas23 Light Load Member

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    Modern trucks have a valve to avoid what is better known as compounding the brakes but either way, you shoud stay off the brakes.
     
    Jrivas23, Jul 9, 2014
    Jrivas23, Jul 9, 2014
    #4
  7. Jul 9, 2014 #5
    snowwy

    snowwy Road Train Member

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    i don't think ANYone keeps their foot off the brake. when applying the knob valve.

    but i'm guessing that ALL of you on this forum DO.
     
    Last edited: Jul 9, 2014
    snowwy, Jul 9, 2014
    snowwy, Jul 9, 2014
    #5
  8. Jul 9, 2014 #6
    Stile

    Stile Heavy Load Member

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    I generally keep my foot on the brake when applying the pedal. I find it's easier to do than using my hands to push that pedal down.
     
    Stile, Jul 9, 2014
    Stile, Jul 9, 2014
    #6
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  9. Jul 9, 2014 #7
    snowwy

    snowwy Road Train Member

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    LOL, i meant to say knob.
     
    snowwy, Jul 9, 2014
    snowwy, Jul 9, 2014
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    Stile Thanks this.
  10. Jul 9, 2014 #8
    FatDaddy

    FatDaddy Road Train Member

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    Crap. I don't even know what I do.
     
    FatDaddy, Jul 9, 2014
    FatDaddy, Jul 9, 2014
    #8
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  11. Jul 9, 2014 #9
    Richter

    Richter Road Train Member

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    I've always heard that, but.....

    How do you keep your truck stopped while putting on parking brakes. I always hold with foot brake then pull parking, then release foot brakes. If you reles foot brake first, truck could roll while waiting for spring to apply.

    I've got almost 350,000 miles under my belt and haven't seen any brake damage do to doing that way. I guess you could hold trailer brake valve, apply truck parking brakes, then relce trailer valve and apply trailer parking?
     
    Richter, Jul 9, 2014
    Richter, Jul 9, 2014
    #9
  12. Jul 11, 2014 #10
    rank

    rank Road Train Member

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    No. The delay will keep it from rolling.

    Have you never had a blown diaphragm in the brake chamber?
     
    rank, Jul 11, 2014
    rank, Jul 11, 2014
    #10
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