Air Brake Issue

Discussion in 'Trucks [ Eighteen Wheelers ]' started by autotech57, Aug 20, 2007.

  1. autotech57

    autotech57 Bobtail Member

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    Aug 20, 2007
    Odessa, Texas
    0
    Hello Everyone...

    I was parking my 99 Freightliner yesterday and put it in reverse, hit the foot brake and then put it in 1st and it would not move. It will spin one rear drive wheel if I get on it a little, so I am assuming the brakes are locked on the front axel. The shoes or liners are in place, not falling out as if a spring came loose. Does anyone have any input on this. Thanks in advance.
     
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  3. mikroos5

    mikroos5 Medium Load Member

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    Nov 16, 2006
    Mass.
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    Sounds too me like you broke something in there.
     
  4. autotech57

    autotech57 Bobtail Member

    4
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    Aug 20, 2007
    Odessa, Texas
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    I am not leaking air anywhere either...
     
  5. mikroos5

    mikroos5 Medium Load Member

    357
    31
    Nov 16, 2006
    Mass.
    0
    could be you broke one of the springs that hold the shoe in place.
     
  6. poppy

    poppy "I Love that Cushaw Pie"

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    Jul 31, 2007
    ky
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    sound like your brake cammed over, stuck the shoes out.
     
  7. autotech57

    autotech57 Bobtail Member

    4
    0
    Aug 20, 2007
    Odessa, Texas
    0
    I did feel a pop in the pedal when I hit the brake. That very well could be...
     
  8. Pur48Ted

    Pur48Ted Road Train Member

    3,643
    5,979
    Jun 14, 2006
    Grand Rapids, MI
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    Yep, sounds like a "cam-over"
    What condition are the shoes?
    What condition are the rims in?
    If the shoes are real worn or the rims are worn beyond specs, your "S-Cam" can "over" rotate and lock your brakes.
     
  9. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    45,384
    Sep 18, 2006
    the road less travelled
    0
    Roadkill and the others have it right.

    Our mechanic calls it over cam. When you check your brakes for wear, you check the thickness of the shoes and the thickness of the drums, on new brakes, both are thick, when they are worn, or the bushings come out or the cam gets damaged is when the brakes over cam. Sometimes there isn't enough brake left after that to stop you, your brakes just don't work as well because once it over cams, it won't apply more. You have lost that brake to help stop you.:biggrin_2555:
     
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