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05 Pete 379 - parking brake issue - "bleeds" air if Air Pressure is below 100 PSI

Discussion in 'Peterbilt Forum' started by indy_colts_fan, Aug 10, 2012.

Page 2 of 2
  1. Aug 11, 2012 #11
    otherhalftw

    otherhalftw R.I.P.

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    Newer air tanks use plastic for the line connection into the tank...check this "seal" if it is plastic. Weather, both cold and hot, will effect it's performance and "sealability".
     
    otherhalftw, Aug 11, 2012
    otherhalftw, Aug 11, 2012
    #11
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  3. Aug 15, 2012 #12
    indy_colts_fan

    indy_colts_fan Bobtail Member

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    So I was taking to a trucker at the truck stop and he said I could perform some diag on each air brake canister to ensure it's not a bad canister... he said take the service line off each canister and see if there is air leaking from the can... at the same time the parking/tractor brake is released and bleeding air.

    well i attempted this today and not sure i did this right. wondering if someone could verify.

    1. air pressure in tractor at 100psi... released tractor/parking brake... bleed issue occurred.
    2. removed the service line (clearly marked and is the larger hose of the two) from Front Driver canister... nothing comming from the can, but air comming from the hose.
    3. placed service line back on canister.
    4. repeat steps 1-4 for each can... same result..

    i am going to assume, the brake canisters are working properly at this point???
     
    indy_colts_fan, Aug 15, 2012
    indy_colts_fan, Aug 15, 2012
    #12
  4. Aug 15, 2012 #13
    bender

    bender Road Train Member

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    There should be no air coming from the hose on that test.
     
    bender, Aug 15, 2012
    bender, Aug 15, 2012
    #13
  5. Aug 15, 2012 #14
    otherhalftw

    otherhalftw R.I.P.

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    CA...gold discovery foothills
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    Agreed...bad valve at tank!
     
    otherhalftw, Aug 15, 2012
    otherhalftw, Aug 15, 2012
    #14
  7. Aug 15, 2012 #15
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    First need to confirm no air pressure in the signal line to that valve before condemning the valve.
     
    bender, Aug 15, 2012
    bender, Aug 15, 2012
    #15
    VisionLogistics Thanks this.
  8. Aug 17, 2012 #16
    indy_colts_fan

    indy_colts_fan Bobtail Member

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    Thanks fellas! I will do some additional diag and let you all know
     
    indy_colts_fan, Aug 17, 2012
    indy_colts_fan, Aug 17, 2012
    #16
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