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ABS issue when loaded

Discussion in 'Trucks [ Eighteen Wheelers ]' started by s0231198, Sep 29, 2016.

  1. Sep 29, 2016 #1
    s0231198

    s0231198 Light Load Member

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    I have a trailer that the abs light will come on around 10 miles of driving after getting loaded, doesn't come on when empty and could drive 100-150 miles and never have it come on, but as soon as get loaded and head on down the road, abs light comes on. Has the mechanics stumped bc have changed sensor and extension cable, and still doing same thing. Any ideas why would be happening when loaded but not empty?
     
    s0231198, Sep 29, 2016
    s0231198, Sep 29, 2016
    #1
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  3. Sep 29, 2016 #2
    Hulld

    Hulld Road Train Member

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    Jack it up and check for play in a wheel bearing.
    Sometimes the air gap can get wider when loaded if you have a loose wheel bearing.....
     
    Hulld, Sep 29, 2016
    Hulld, Sep 29, 2016
    #2
    tony97905 Thanks this.
  4. Sep 29, 2016 #3
    swaan

    swaan Road Train Member

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    BC canada
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    About the only thing it could be.

    Wheel bearing end play is on the loose side. I generally set them up so no play at all. Just a touch of preload. But everybody has their opinion on that.
     
    swaan, Sep 29, 2016
    swaan, Sep 29, 2016
    #3
    GrapeApe Thanks this.
  5. Sep 29, 2016 #4
    Hulld

    Hulld Road Train Member

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    Upstate NY
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    Exactly how I set mine.
    Never an issue.....
     
    Hulld, Sep 29, 2016
    Hulld, Sep 29, 2016
    #4
    swaan Thanks this.
  7. Sep 30, 2016 #5
    GrapeApe

    GrapeApe Road Train Member

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    Same here. Specs are 0.001"-0.005" end play on most hubs, but I have always ran about 1/8 turn of preload with no issues. I have seen many intermittent erratic signal ABS faults solved by adjusting wheel bearings that were supposedly "in spec". 0.003" or more can give an occasional fault.
     
    Last edited: Sep 30, 2016
    GrapeApe, Sep 30, 2016
    GrapeApe, Sep 30, 2016
    #5
    tony97905, Heavyd and swaan Thank this.
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