Steer brake question

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wtxiceman, Aug 30, 2019.

  1. wtxiceman

    wtxiceman Bobtail Member

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    Jun 23, 2013
    w.tx
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    20190608_194929.jpg 20190608_194924(0).jpg

    Ive been told this is ok but i worry about it. Brake shoes set in drum almost half inch at s cam and flush on other end.
    Anybody know what would cause this?
    Thanks
     
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  3. CountryBumkin

    CountryBumkin Bobtail Member

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    Jun 4, 2018
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    Possibly the backing plate (Spider assembly) is not mounted "square" to the axle spindle (or got bent). Maybe brake shoes are not machined correctly or lining was riveted to the shoes incorrectly (out of alignment).

    Does the other side look better?

    Also looks like shoes are not adjusted correctly (there's a larger gap between lining and drum then I would expect to see)
     
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  4. wtxiceman

    wtxiceman Bobtail Member

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    Jun 23, 2013
    w.tx
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    The other side looks like i would expect. I agree they need to be adjusted a little..
    Thought about tearing it down but ive never worked on truck brakes before
     
  5. AModelCat

    AModelCat Road Train Member

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    Cams aren't bent are they? Position looks consistent on the anchor pin ends, looks like the issue is on the cam end.
     
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  6. Working2party

    Working2party Medium Load Member

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    I see that a lot with trailer brakes, usually indicates (for trailers anyway) that the S-cams bushings are worn out, the Drums are worn/belled out, and the shoe pivot pins need replaced.

    There’s a chance you could remove the pads and switch positions to correct them back into the drum. This could be temporary or permanent.

    Usually when i see it the pads are close enough for replacement so I can’t say for sure.

    And this could be completely different for steer brakes. They are basically the same so it stands to reason it would be the same.
     
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  7. Rideandrepair

    Rideandrepair Road Train Member

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    If the spiders bent, the shoes will be noticeably crooked in relation to drum, My trailer had the same issue, I thought spider was bent, or cam bushings bad, maybe. New shoes now, no more problem. I think the old ones were a bit wider, for some reason, although I replaced withsame part #s. Maybe springs were weak,really don’t know. It’s strange. Are your drums wore in? I’d adjust them good, and keep an eye on them. Bent spider is all but impossible to straighten. No one wants to touch that one, especially with heat. Usually they weld on a new one. Axle surgeon does them. $$$$$
     
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  8. ClineER

    ClineER Light Load Member

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    Looks like new brakes? I see that alot with cheaper reman pads, the cores dont seem consitent. I say run them, havent ever seen an issue from it.
     
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  9. wtxiceman

    wtxiceman Bobtail Member

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    Jun 23, 2013
    w.tx
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    Brakes work and feel fine. I can hit the pedal and truck tracks straight.

    Ive always wondered if i get pulled over and inspected is this going to be an oh my you're out of service deal.
     
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