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Braking issue, need help troubleshooting.

Discussion in 'Experienced Truckers' Advice' started by mn777, Aug 12, 2025 at 10:03 PM.

  1. Aug 12, 2025 at 10:03 PM #1
    mn777

    mn777 Bobtail Member

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    Jan 30, 2025
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    On my FLD120, when coming to a stop, right before fully stopping it feels like the brakes fully stop working for a split second — even though I’m holding the brake pedal with the same stable pressure, its long enough where if I had to stop very close to a car in front I would most likely rear end them. Then, less than a second later, the trailer wheels grab hard and sometimes lock up. This just started happening after switching to a different trailer.
    Trailer is fairly new and has an inspection sticker from a month ago. I’m 1200 miles from home, what can I do to narrow down the potential issue?
    Thank you in advance!
     
    mn777, Aug 12, 2025 at 10:03 PM
    mn777, Aug 12, 2025 at 10:03 PM
    #1
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  3. Aug 12, 2025 at 10:14 PM #2
    JB7

    JB7 Heavy Load Member

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    "This just started happening after switching to a different trailer." So the problem is highly likely to be in the trailer. Do you own or lease the trailer? If not you call and tell them that the trailer is unsafe and needs to be looked at and/or repaired. If you have a spare cord I would swap that and see if it makes any difference.
     
    JB7, Aug 12, 2025 at 10:14 PM
    JB7, Aug 12, 2025 at 10:14 PM
    #2
  4. Aug 13, 2025 at 1:12 AM #3
    Moosetek13

    Moosetek13 Road Train Member

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    I'm wondering why being 1200 miles from home is important.

    Different trailer and brakes acting up.
    Maybe water in the trailer brake lines?
    Water does not compress but it can move around, perhaps causing erratic behavior.
     
    Moosetek13, Aug 13, 2025 at 1:12 AM
    Moosetek13, Aug 13, 2025 at 1:12 AM
    #3
  5. Aug 13, 2025 at 1:29 AM #4
    mn777

    mn777 Bobtail Member

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    Now that you mention it, it did start doing it after a night of heavy rain, what would be the best way to check for this?
     
    mn777, Aug 13, 2025 at 1:29 AM
    mn777, Aug 13, 2025 at 1:29 AM
    #4
  7. Aug 13, 2025 at 6:22 AM #5
    TripleSix

    TripleSix God of Roads

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    Does your truck have a trailer hand brake?
     
    TripleSix, Aug 13, 2025 at 6:22 AM
    TripleSix, Aug 13, 2025 at 6:22 AM
    #5
  8. Aug 13, 2025 at 7:05 AM #6
    Deere hunter

    Deere hunter Road Train Member

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    Your anti lock is acting up.
     
    Deere hunter, Aug 13, 2025 at 7:05 AM
    Deere hunter, Aug 13, 2025 at 7:05 AM
    #6
    Rideandrepair Thanks this.
  9. Aug 13, 2025 at 9:07 AM #7
    mn777

    mn777 Bobtail Member

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    Jan 30, 2025
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    Yes
     
    mn777, Aug 13, 2025 at 9:07 AM
    mn777, Aug 13, 2025 at 9:07 AM
    #7
  10. Aug 13, 2025 at 10:56 AM #8
    buzzarddriver

    buzzarddriver Road Train Member

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    Have you drained any condensation from your trailer air tank back above the rear axle?
     
    buzzarddriver, Aug 13, 2025 at 10:56 AM
    buzzarddriver, Aug 13, 2025 at 10:56 AM
    #8
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