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1998 peterbilt 379 Cummins N14 celect plus air leak problem

Discussion in 'Peterbilt Forum' started by Gill1321, Jul 7, 2019.

  1. Jul 7, 2019 #1
    Gill1321

    Gill1321 Bobtail Member

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    Jul 7, 2019
    0
    Air was leaking badly from the ABS module valve located behind the fifth wheel on a cross member above the rear axel . Air tanks were loosing air pressure.. replaced the ABS module valve it comes in a set of three valve. Replaced the quick release valve .. drained the air tanks there was collant comming out along with the air tanks .. the truck is not making air now ... they changed the following parts new air compressor ,air dryer , foot valve , dash valve ,tractor protection valve
    But still after doing all the the air is still leaking from the new foot valve .. can’t understand sitting at shop from one week can’t find any solution for this air leak
    Please help
     
    Gill1321, Jul 7, 2019
    Gill1321, Jul 7, 2019
    #1
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  3. Jul 7, 2019 #2
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    Did you check that the braided steel signal line from the air compressor to the air dryer doesn’t have a hole/break in it which would cause your system not to build up pressure?

    Also tell the shop to stop throwing parts at the truck and find the root cause of the problem, if they can’t find it, take it to another shop.
     
    boneebone, Jul 7, 2019
    boneebone, Jul 7, 2019
    #2
    goga Thanks this.
  4. Jan 28, 2022 #3
    CascadeDiesel509

    CascadeDiesel509 Bobtail Member

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    Apr 17, 2019
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    Were you able to solve this issue?
     
    CascadeDiesel509, Jan 28, 2022
    CascadeDiesel509, Jan 28, 2022
    #3
  5. Jan 28, 2022 #4
    goga

    goga Heavy Load Member

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    Nov 11, 2021
    Earth..
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    Amen and bow to the wisdom)
     
    goga, Jan 28, 2022
    goga, Jan 28, 2022
    #4
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