Air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ColumbiaBoB, Nov 6, 2015.

  1. sailboatjim

    sailboatjim Light Load Member

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    Aug 27, 2014
    Boston, Mass
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    The individual valves are very simple to rebuild. This is a package unit though so it may be more difficult. That particular relay has a spring under the valve that determines the crack pressure so the crack pressures need to be the same if you replace it. More than likely the crack pressure is 4 psi. Crack pressure is the pressure that determines when the valve starts to open/sending air to the brake chamber from the supply line. That is the pressure you send it from the brake treadle valve. I saw that valve package somewhere yesterday online for 300 dollars or so. Don't remember the exact amount. Watch this video and good luck.
     
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  3. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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    Well i took it apart and as you can see rubber thing is the problem, can that be replaced or just buy new. Thx
     

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  4. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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    Where would you even buy such a thing
     

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  5. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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    One more
     

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  6. RustyBolt

    RustyBolt Road Train Member

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    Feb 21, 2015
    Bement, IL
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    When you buy the entire assembly new, they throw one of those in for free.
     
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  7. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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  8. sailboatjim

    sailboatjim Light Load Member

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    Aug 27, 2014
    Boston, Mass
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    The new one is saw on line were about 300 dollars.
    Did it not have a spring under it?
     
  9. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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    2 springs, one right under cover and second under rubber
     
  10. ColumbiaBoB

    ColumbiaBoB Light Load Member

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    May 3, 2011
    Des Moines, IA
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    Had to replace it,but just the middle part. Local freightliner had it for 90.78+tax, not bad. Thx for all the help and keep on trucking.
     

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  11. sailboatjim

    sailboatjim Light Load Member

    292
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    Aug 27, 2014
    Boston, Mass
    0
    Glad you got it.
     
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