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Pete 389. Parking brake won't release, please help

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Just.Do.It, Sep 2, 2019.

Page 2 of 11
  1. Sep 2, 2019 #11
    spsauerland

    spsauerland Road Train Member

    4,296
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    West Harrison, In
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    Upload a picture of the valve that is leaking air out of it.
     
    spsauerland, Sep 2, 2019
    spsauerland, Sep 2, 2019
    #11
    x1Heavy, Just.Do.It and AModelCat Thank this.
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  3. Sep 2, 2019 #12
    Just.Do.It

    Just.Do.It Light Load Member

    55
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    Jul 23, 2018
    Tampa FL
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    That thing is making air noise when Yellow knob pushed it. This valve assembly was replaced, but new one make same air noise, and tractor wheels still locked up.
     

    Attached Files:

    Just.Do.It, Sep 2, 2019
    Just.Do.It, Sep 2, 2019
    #12
    x1Heavy Thanks this.
  4. Sep 2, 2019 #13
    spsauerland

    spsauerland Road Train Member

    4,296
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    May 31, 2010
    West Harrison, In
    0
    That is the drive axle service brake relay valve with ABS modulator valves. You need to double check that a brake chamber doesn't have bad pushrod seal allowing air to leak from emergency side to service side and leaking out of the exhaust of service brake relay valve. You can crimp the service lines with pinch off pliers or just remove service hoses from brake chambers and release brakes and feel the service port.
     
    spsauerland, Sep 2, 2019
    spsauerland, Sep 2, 2019
    #13
    InTooDeep, Just.Do.It, AModelCat and 2 others Thank this.
  5. Sep 2, 2019 #14
    JonJon78

    JonJon78 Road Train Member

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    Did that entire 3 part ABS module get replaced or only one of them?
     
    JonJon78, Sep 2, 2019
    JonJon78, Sep 2, 2019
    #14
    Just.Do.It Thanks this.
  6. Sep 2, 2019 #16
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    Will do that, thank you
     
    Just.Do.It, Sep 2, 2019
    Just.Do.It, Sep 2, 2019
    #16
  7. Sep 2, 2019 #16
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    The entire assembly was replaced, didn't help at all.
     
    Just.Do.It, Sep 2, 2019
    Just.Do.It, Sep 2, 2019
    #16
  8. Sep 2, 2019 #17
    JonJon78

    JonJon78 Road Train Member

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    Where is the truck at now?
     
    JonJon78, Sep 2, 2019
    JonJon78, Sep 2, 2019
    #17
    Just.Do.It Thanks this.
  9. Sep 2, 2019 #18
    Just.Do.It

    Just.Do.It Light Load Member

    55
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    Jul 23, 2018
    Tampa FL
    0
    Parked on the shoulder, I-80W, mile 32. No help is available until tomorrow morning. #### long weekend..
     
    Just.Do.It, Sep 2, 2019
    Just.Do.It, Sep 2, 2019
    #18
    JonJon78 Thanks this.
  10. Sep 2, 2019 #19
    JonJon78

    JonJon78 Road Train Member

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    Wow. That stinks. Your having that same mechanic come back or another company?
     
    JonJon78, Sep 2, 2019
    JonJon78, Sep 2, 2019
    #19
    Just.Do.It Thanks this.
  11. Sep 2, 2019 #20
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    Same company, but maybe another guy will be here tomorrow morning. They going to replace Parking Valve assembly, the one with Red/Yellow knobs. But somehow I have a feeling it won't help.
     
    Just.Do.It, Sep 2, 2019
    Just.Do.It, Sep 2, 2019
    #20
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