Trailer parking brakes are not setting

Discussion in 'Freightliner Forum' started by Dorego401, Mar 31, 2021.

  1. Dorego401

    Dorego401 Bobtail Member

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    Problem with my trailer brakes. Parking brakes do not work when set . But Trolly brake are working on the trailer . Getting air at the gland hand . Truck is a freightliner . Trailer is a boydstun Any suggestions
     
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  3. xsetra

    xsetra Road Train Member

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    First guess, Brakes out of adjustment.
    2nd weak springs.
     
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  4. AModelCat

    AModelCat Road Train Member

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    Sounds like a trailer issue.
     
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  5. Hulld

    Hulld Road Train Member

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    Lines hooked up correctly?
     
  6. skallagrime

    skallagrime Heavy Load Member

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    Third guess, single air cans, trailer doesnt have brakes

    (They exist, its not common, and i dont like it, but it crops up here and there)
     
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  7. SmallPackage

    SmallPackage Road Train Member

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    With the trailer park brakes not set (trailer air charged) pop the red glad hand off by hand and see if the spring brakes instantly set in emergency mode. If not then the trailer control valve under the trailer at its air tank is bad. Most likely the quick release side of valve.
     
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  8. SmallPackage

    SmallPackage Road Train Member

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    I was thinking this at first too because I have a few of them in service but I looked up the trailer brand he has and I don’t think they would be spring brake exempt. I could be wrong, however.
     
  9. skallagrime

    skallagrime Heavy Load Member

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    Fair enough, we had one of our stretch trailers that was newer set up that way (97-2005?) Wether it was stock and exempt because it had special useage or it just got converted on someones whim i never knew, but i was pulling 80-100 foot crane beams on an old truck and dot never bothered with me. Prefered the other trailers most of the time, but it was much easier to get rolling even if it had sat 3 months and was frozen outside :p
     
  10. AModelCat

    AModelCat Road Train Member

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    Pole trailers and lowbeds don't need to have spring brakes IIRC.
     
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  11. skallagrime

    skallagrime Heavy Load Member

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    Huh, interesting, today i learned eh?
    Well i looked up his car hauling trailer, it looks like a pretty low bed... :p
     
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