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Trailer air brakes

Discussion in 'Trailers' started by Frederick T Haas, Nov 19, 2021.

  1. Frederick T Haas

    Frederick T Haas Member

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    I have a 2012 wilkens walking floor trailer, we have put new drums, and new shoes on it and even after adjusting the brakes will not hold a loaded trailer. Any help resolving this problem would be appreciated.
     
  2. Pops52

    Pops52 Well-Known Member

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    Occupation:
    part time lowbed driver "retired"
    Location:
    Penn Valley, CA
    Strange.... couple questions first. Has Automatic slack adjusters? It should have. 2 Are you experienced with this type of brake work? Is a picture of the brake shoes, drum, brake pot and slack adjuster with brakes released available?
     
  3. Jonas302

    Jonas302 Senior Member

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    mn
    When you say hold a loaded trailer are you talking parking brakes ? If so the springs may be broken in your brake cans take the rubber plug out shine a light in for a look run your finger in the spring checking for breaks given that they still rely on the foundation brakes to be in good working order have someone apply the brakes and measure the stroke, look for wore s cam bushings brake can mounts rusted and flexing
     
  4. Truck Shop

    Truck Shop Senior Member

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    Parking brake spring check.
     
  5. Frederick T Haas

    Frederick T Haas Member

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    I does have automatic slack adjusters, I have done some brake repairs, but I'm no mechanic. I have done some further trouble shooting, and 3 of the S cam shafts have some play in them at the bushing, could this be the problem? Everything else seems to be working properly.
     
  6. Frederick T Haas

    Frederick T Haas Member

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    Yes, the parking brake does not hold, stroke is good on all of them, however there is some play in 3 of the bushings, not major, but some. We are thinking this could be the problem.
     
  7. Truck Shop

    Truck Shop Senior Member

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    Parking brake side of the brake chambers is more than likely bad. Moisture, and dirt will cause them to
    rust the killer spring inside and eventually it breaks. Average life of a brake can is 4 to 6 years and those
    start to fail.
     
    Spud_Monkey, Pops52 and Jonas302 like this.
  8. Jonas302

    Jonas302 Senior Member

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    Will the trailer hold with the jonny bar on the brakes? If it does it would confirm the springs being broken
     
    Pops52 likes this.
  9. Frederick T Haas

    Frederick T Haas Member

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    I will check that out, but just wondering, will the brakes look like they are working with a spring broke?
     
  10. Frederick T Haas

    Frederick T Haas Member

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    They do seem to hold better with the jonny bar, but no totally. I guess I better check the springs. Thanks for the info.
     
  11. Truck Shop

    Truck Shop Senior Member

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    Yes-It's really obvious on trailers with sliders.
     
  12. Frederick T Haas

    Frederick T Haas Member

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    I will check them out, Thanks.
     
  13. Shimmy1

    Shimmy1 Senior Member

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    Need pictures of each brake chamber, brakes set, released, and applied with the jonny bar. Needs to show axle, slack adjuster, and s-cams.
     
  14. Truck Shop

    Truck Shop Senior Member

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    What for? those air chambers are more than likely original equipment. 11 years old.
     
  15. Shimmy1

    Shimmy1 Senior Member

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    We have trucks and trailers that are almost 20 years old, and have never had to replace a chamber due to a rotted spring. Not saying that isn't his problem, but I'd sure as heck be verifying that he has the slacks properly adjusted before assuming the chambers are shot. By his own admission, he says he isn't a mechanic.

     
  16. Truck Shop

    Truck Shop Senior Member

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    Really when it comes to brakes unless it's a hands on inspection-all the advise is pretty worthless including mine.
    2012 should have auto slacks and unless he measuring the stroke we won't know because there is no camera
    that will perform that.

    And one real big fact unless the OP or anyone else on here is brake certified and carrying a
    {Brake Inspection Certification Card as required under mandate 396.25 section 3{A} as described within the federal register. They can't even touch a air brake system-can't even adjust them. So it's hands off for everyone.

    But I have been trained and updated to cover all air disc and carry a card.
     
    Spud_Monkey likes this.
  17. Frederick T Haas

    Frederick T Haas Member

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    Location:
    Seneca Kansas
    A couple of the chambers have been replaced, I am not a mechanic but I do know how to adjust the brakes, and they are properly adjusted. They are automatic, but I have found that even these need adjusted ocassionaly, but I don't like messing with the chambers, or s cam bushings, the boss has decide to take it to a shop. Thanks for all the responses, I appreciate them.
     
    Truck Shop likes this.
  18. Frederick T Haas

    Frederick T Haas Member

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    Location:
    Seneca Kansas
    Our trailer hauls garbage to a landfill, so they take a lot of mud, and other debris, 2 of them have been replaced, but not recently.
     
    Truck Shop likes this.
  19. Shimmy1

    Shimmy1 Senior Member

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    Brake chambers packed full of mud under the piston.
     
  20. Truck Shop

    Truck Shop Senior Member

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    No kidding.