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Jake Brake Problem on C15 6nz56132

Discussion in 'Trucks [ Eighteen Wheelers ]' started by agariza, Jan 6, 2012.

  1. Jan 6, 2012 #1
    agariza

    agariza Bobtail Member

    14
    0
    Aug 10, 2011
    0
    My Jake brakes were working good then they suddenly got week. Manifold pressure is down as well but I believe its a sensor because the truck is running good. Changed out all three sylinoids. jakes are working in low med and high however doesnt hold you back.
    Does anyone have any suggestions on what to do. The Pete is a 379, 2002 with a C15. Listed s/n of engine above.

    Thanks
     
    agariza, Jan 6, 2012
    agariza, Jan 6, 2012
    #1
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  3. Jan 6, 2012 #2
    kklogger

    kklogger Bobtail Member

    27
    2
    May 16, 2009
    b.c.
    0
    if its a pacbrake might be a cracked jake head.
     
    kklogger, Jan 6, 2012
    kklogger, Jan 6, 2012
    #2
  4. Jan 6, 2012 #3
    07-379Pete

    07-379Pete Crusty Commando-Pete

    2,549
    2,347
    Oct 3, 2008
    Campbellsville, Ky
    0
    6nz cat didnt use the cat brake
     
    07-379Pete, Jan 6, 2012
    07-379Pete, Jan 6, 2012
    #3
  5. Jan 7, 2012 #4
    kklogger

    kklogger Bobtail Member

    27
    2
    May 16, 2009
    b.c.
    0
    I had a truck with a 6NZ and it had a PAC brake not a CAT brake.
    Jake would be working fine then all of a sudden it goes soft.
    PAC brake head castings were to thin and they would hairline crack and bypass oil causing the jake to still work but not 100%.
    Updated ones had heavier castings,problem solved.
    Just my experience,hope it helps some.
     
    kklogger, Jan 7, 2012
    kklogger, Jan 7, 2012
    #4
  7. Jan 20, 2012 #5
    kklogger

    kklogger Bobtail Member

    27
    2
    May 16, 2009
    b.c.
    0
    Just wondering if you fixed the jake problem?
     
    kklogger, Jan 20, 2012
    kklogger, Jan 20, 2012
    #5
  8. Jan 21, 2012 #6
    KaptainKenworth

    KaptainKenworth Bobtail Member

    33
    18
    Jan 19, 2012
    Alberta Canada
    0
    Kinda sound like maybe a weak or broken spring, sticking contol valve, leaking solenoid or piston..also have a close look at the wiring harness for loose conections or rub spots. probably should remove the heads and inspect them .. rebuild kits are fairly inexpensive.

    Valve set is critical for performance
     
    KaptainKenworth, Jan 21, 2012
    KaptainKenworth, Jan 21, 2012
    #6
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