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1 Trailer brake locking up

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by homesick, Oct 4, 2021.

  1. Oct 4, 2021 #1
    homesick

    homesick Light Load Member

    161
    8
    Nov 26, 2007
    memphis,tn
    0
    Trailer brakes on the left front Axle keeps locking up and putting flat spots on the tires replaced the s cam and bushings,new brakes and drums slack adjuster,abs valve and brake chamber but still locking up when you have to make a sudden stop. Any ideas what it can be?
     
    homesick, Oct 4, 2021
    homesick, Oct 4, 2021
    #1
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  3. Oct 4, 2021 #2
    AModelCat

    AModelCat Road Train Member

    27,709
    145,170
    Jul 7, 2015
    Canuckistan
    0
    Suspension issue not allowing adequate weight onto that corner?
     
    AModelCat, Oct 4, 2021
    AModelCat, Oct 4, 2021
    #2
    Big Road Skateboard Thanks this.
  4. Oct 4, 2021 #3
    Big Road Skateboard

    Big Road Skateboard Road Train Member

    4,365
    20,735
    May 2, 2021
    0
    Flatbed with not much weight? Like @AModelCat said. For some reason you've got no traction there.

     
    Big Road Skateboard, Oct 4, 2021
    Big Road Skateboard, Oct 4, 2021
    #3
  5. Oct 4, 2021 #4
    homesick

    homesick Light Load Member

    161
    8
    Nov 26, 2007
    memphis,tn
    0
    I forgot to mention it's a 53 dry van
     
    homesick, Oct 4, 2021
    homesick, Oct 4, 2021
    #4
  7. Oct 4, 2021 #5
    feldsforever

    feldsforever Road Train Member

    1,453
    1,440
    Nov 22, 2019
    0
    Greese/oil? Broken gear?
     
    feldsforever, Oct 4, 2021
    feldsforever, Oct 4, 2021
    #5
  8. Oct 4, 2021 #6
    skallagrime

    skallagrime Road Train Member

    3,579
    9,115
    Apr 10, 2012
    Indiana
    0
    Given that youve relaced everything but the axle itself, 2 things come to mind

    1. When replacing the slack adjuster and chamber, mechanic didnt set slack adjuster to correct length

    2. The way the slack adjuster mounts is messed up and allows too much flex/is hanging
     
    skallagrime, Oct 4, 2021
    skallagrime, Oct 4, 2021
    #6
  9. Oct 5, 2021 #7
    Shawn2130

    Shawn2130 Heavy Load Member

    870
    1,806
    Sep 20, 2015
    Ontario
    0
    Our stepdeck trailer did that. Had a brake job done both sides for front axle of a tridem.

    Thought the brakes needed breaking in but it kept doing it. Locking up, sliding tires.

    I backed off the slack adjuster a bit more to allow more room for breaking in.

    Still does it. I checked the other 2 axles brakes as well. They appeared fine, had lining and working fine but more likely glazed and not braking enough so I replaced all of the pads and drums. The front axle was working harder than the other two.

    Trailer has been fine since.
     
    Shawn2130, Oct 5, 2021
    Shawn2130, Oct 5, 2021
    #7
  10. Oct 5, 2021 #8
    homesick

    homesick Light Load Member

    161
    8
    Nov 26, 2007
    memphis,tn
    0
    I replaced all the brakes and drums still locking up
     
    homesick, Oct 5, 2021
    homesick, Oct 5, 2021
    #8
  11. Oct 5, 2021 #9
    nikmirbre

    nikmirbre Road Train Member

    5,048
    8,688
    Jul 27, 2011
    High Point NC
    0
    My RGN does this at times if I set the ride height to manual and don't have the same setting on all 3 axles.....id say you have a suspension issue.
     
    nikmirbre, Oct 5, 2021
    nikmirbre, Oct 5, 2021
    #9
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