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2018 Peterbilt Steer Axle Backing Plate cracking?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Stimp909, Apr 23, 2019.

  1. Apr 23, 2019 #1
    Stimp909

    Stimp909 Bobtail Member

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    Apr 23, 2019
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    2018 peterbuilts. Has anyone come across backing plates doing this? Second truck in a week has this crack.
     

    Attached Files:

    Stimp909, Apr 23, 2019
    Stimp909, Apr 23, 2019
    #1
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  3. Apr 23, 2019 #2
    AModelCat

    AModelCat Road Train Member

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    Wow that is one cheap ### brake spider!!!
     
    AModelCat, Apr 23, 2019
    AModelCat, Apr 23, 2019
    #2
    pushbroom Thanks this.
  4. Apr 23, 2019 #3
    Stimp909

    Stimp909 Bobtail Member

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    Apr 23, 2019
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    I lifted the hoods on 34 other trucks in my customers fleet yesterday. All with the new style plate. No others have the crack. The pictures came off a truck with 30k. The second has 105k on the clock. Either way that's a terrible design. We are racking our brains trying to figure out how.
     
    Stimp909, Apr 23, 2019
    Stimp909, Apr 23, 2019
    #3
  5. Apr 23, 2019 #4
    Heavyd

    Heavyd Road Train Member

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    Cheap China steel.
     
    Heavyd, Apr 23, 2019
    Heavyd, Apr 23, 2019
    #4
    AModelCat and spsauerland Thank this.
  7. Apr 23, 2019 #5
    Mr Bob

    Mr Bob Light Load Member

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    If your brakes vibrate it will tend to crack.
     
    Mr Bob, Apr 23, 2019
    Mr Bob, Apr 23, 2019
    #5
  8. Apr 23, 2019 #6
    Goodysnap

    Goodysnap Road Train Member

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    What models are you seeing this on? Are they a large batch or far apart in age? Same side? Left or right?
     
    Goodysnap, Apr 23, 2019
    Goodysnap, Apr 23, 2019
    #6
    pushbroom Thanks this.
  9. Apr 23, 2019 #7
    spsauerland

    spsauerland Road Train Member

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    Looks brake torque related. Seen many stamped spiders crack like that on steerable lift axles. I would be calling Bendix ASAP.
     
    spsauerland, Apr 23, 2019
    spsauerland, Apr 23, 2019
    #7
    pushbroom Thanks this.
  10. Apr 26, 2019 #8
    TTNJ

    TTNJ Heavy Load Member

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    The steel probably isn’t the issue, it’s how they heat treated the steel
     
    TTNJ, Apr 26, 2019
    TTNJ, Apr 26, 2019
    #8
    Heavyd Thanks this.
  11. Apr 26, 2019 #9
    Heavyd

    Heavyd Road Train Member

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    Yes, this isn't done properly there either.
     
    Heavyd, Apr 26, 2019
    Heavyd, Apr 26, 2019
    #9
    spsauerland Thanks this.
  12. Aug 7, 2020 #10
    spsauerland

    spsauerland Road Train Member

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    Seen this today and remembered this thread. Hope it helps out someone else.
     

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    spsauerland, Aug 7, 2020
    spsauerland, Aug 7, 2020
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    Goodysnap Thanks this.
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