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Semi Trailer brakes slow to release

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ichudov, Jul 19, 2018.

  1. Jul 19, 2018 #1
    ichudov

    ichudov Heavy Load Member

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    Mar 14, 2012
    Berkeley, IL
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    I noticed that the trailer's air brakes are slow to release. I let g oof brakes but continue slowing down. Further investigation shows that it is only one axle out of two (we lifted the rear end with a forklift). What could be the culprit here?
     
    ichudov, Jul 19, 2018
    ichudov, Jul 19, 2018
    #1
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  3. Jul 19, 2018 #2
    Oldironfan

    Oldironfan Road Train Member

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    May 22, 2017
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    Brake chambers. Broken springs.
     
    Oldironfan, Jul 19, 2018
    Oldironfan, Jul 19, 2018
    #2
  4. Jul 19, 2018 #3
    AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    So its when you let off the brake pedal? Both wheels on the same axle? If so it has to be something common to both sides on that axle on the air system. Sounds like maybe a quick release valve is not exhausting, so the air has to vent out the relay valve instead. Maybe the relay valve exhaust itself is plugged up or jammed?
     
    AModelCat, Jul 19, 2018
    AModelCat, Jul 19, 2018
    #3
    Oxbow, ichudov, Grubby and 2 others Thank this.
  6. Nov 2, 2019 #5
    Dewdew82

    Dewdew82 Bobtail Member

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    Nov 2, 2019
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    Changed my passthrough air intake manifold under the steering wheel on my 2013 freightliner but now only when I hook up to different trailers it take about 10 to 15 seconds for the trailer brakes to completely to release when I step on the brake pedal why is this
     
    Dewdew82, Nov 2, 2019
    Dewdew82, Nov 2, 2019
    #5
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