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Slack Adjuster Needs Replacement?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PE_T, Sep 5, 2019.

  1. Sep 5, 2019 #1
    PE_T

    PE_T Road Train Member

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    I checked the push rod travel on all of my brakes (Type 30; steer type 20). They were all under 2 inches, but one slack adjuster was at 2 inches, and on the same axle, but opposite side I’m getting 1 inch 12/16. I tried self-adjusting them with the brake pedal, but it’s not working.

    2014 Freightliner Cascadia DD15.
     
    Last edited: Sep 5, 2019
    PE_T, Sep 5, 2019
    PE_T, Sep 5, 2019
    #1
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  3. Sep 6, 2019 #2
    Doealex

    Doealex Medium Load Member

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    Yes, you need to replace it.
     
    Doealex, Sep 6, 2019
    Doealex, Sep 6, 2019
    #2
    PE_T Thanks this.
  4. Sep 6, 2019 #3
    LDLWells

    LDLWells Heavy Load Member

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    Gotta adjust them. The bumps and vibration are hell on them.

     
    LDLWells, Sep 6, 2019
    LDLWells, Sep 6, 2019
    #3
    speedyk, D.Tibbitt and PE_T Thank this.
  5. Sep 6, 2019 #4
    AModelCat

    AModelCat Road Train Member

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    I wouldn't point the finger at the slack adjuster quite yet. Auto slacks are dependent on pushrod angle or an external bracket to maintain correct applied stroke. If the brake chambers on the wheels with stroke issues have ever been changed, verify the pushrods were cut to the proper length. Too long or too short will throw off their adjustment.
     
    AModelCat, Sep 6, 2019
    AModelCat, Sep 6, 2019
    #4
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  7. Sep 7, 2019 #5
    stillwurkin

    stillwurkin Road Train Member

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    stillwurkin, Sep 7, 2019
    stillwurkin, Sep 7, 2019
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    PE_T Thanks this.
  8. Sep 7, 2019 #6
    stillwurkin

    stillwurkin Road Train Member

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    Dont know how my post went intertwined with yours!!?? Must have screwed it up somehow?
     
    stillwurkin, Sep 7, 2019
    stillwurkin, Sep 7, 2019
    #6
    PE_T Thanks this.
  9. Sep 7, 2019 #7
    speedyk

    speedyk Road Train Member

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    When you click Reply it quotes that post, the you can type below. If you just post it doesn't quote.

    Thanks for that video.
     
    speedyk, Sep 7, 2019
    speedyk, Sep 7, 2019
    #7
    stillwurkin and PE_T Thank this.
  10. Sep 7, 2019 #8
    PE_T

    PE_T Road Train Member

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    See image below.
     

    Attached Files:

    PE_T, Sep 7, 2019
    PE_T, Sep 7, 2019
    #8
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