Trailer "jumps/hops/skids" When Braking Empty/Light Load

Discussion in 'Experienced Truckers' Advice' started by KWP_15, May 22, 2020.

  1. KWP_15

    KWP_15 Bobtail Member

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    Hello,
    I need advice on what can be wrong with my trailer. I have a 2016 Utility 3000r with the hendrickson ultra-k suspension w surelock. Recently I've had brakes, and drums replaced all around. I noticed the trailer did the jump about a month ago a few times when braking a little hard when empty or light, the shop went ahead and replaced an "air control valve" for about 500. Sorry, I'm not sure which valve it is or if there is only one valve, it seemed decently sized when they removed it. Now yesterday I had a light load and had to apply brakes a bit harder, and the trailer jumped quite a bit when braking yesterday when I was looking back in the mirror.. What can it be or what should I look for?? It's a fairly new trailer, don't want to just start throwing parts at it..

    Thanks in advance for your contributions!
     
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  3. AModelCat

    AModelCat Road Train Member

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    Started before or after the brakes were done?
     
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  4. uncleal13

    uncleal13 Road Train Member

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    Mine will do that if I lose power to the abs module from a corroded wire.
     
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  5. aaronpeterbilt3787

    aaronpeterbilt3787 Light Load Member

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  6. Cattleman84

    Cattleman84 Road Train Member

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    Brakes adjusted to tightly... Or ABS issues??? Sounds like the brakes are locking up completely. I dont know allbthe parts to brake systems... But maybe the relief port/valve??? that vents pressure to release brakes when you lift your foot off the brake pedal isnt functioning properly???
     
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  7. skellr

    skellr Road Train Member

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    Too long of a pushrod will also do it. What did they replace on the "brake job"? Just the shoes?
     
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  8. KWP_15

    KWP_15 Bobtail Member

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    The brake job was new brakes and drums. Before replacing the brakes, when I would slide tandems, the tires wouldn't stay put while sliding. About a month after brake job I noticed the trailer "jump" twice, and the shop replaced the abs valve. After replacing the valve, the whole trip i had a heavy load so didn't notice anything. Now with a light load, it seems to be pretty bad compared to before replacing the valve..
     
  9. aaronpeterbilt3787

    aaronpeterbilt3787 Light Load Member

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    Could still be a faulty abs valve. I’ve seen them replaced on our stoughtens, same result. Replace again problem solved. Is abs light on trailer staying on with a brake app?
     
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  10. Dale thompson

    Dale thompson Road Train Member

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