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  1. #1
    Veteran Member KeithInSpace's Avatar
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    May 2006
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    Fred'burg, Virginia
    Tractor
    Kubota BX2230

    Default Trailer brakes "bind" in traffic...brake controller "feedback"???

    Not sure what causes it. Only happens when the trailer is loaded. Generally only happens with the brakes get hot.

    Basically, I'm coming up on a light and I hit my brakes like normal. Everything is going OK, but when I slow down a bit, the trailer feels like it starts grabbing more and more until I barely have any pressure on the truck's brake pedal and the trailer is slowing me down.

    It seems like the inertial sensor in the controller gets into a type of "feedback loop" where it reads the trailer slowing the truck down as MORE brake pedal pressure, so it applies more pressure to the brake, which it reads as more pedal pressure...so on and so forth.

    Does this happen to everyone? Do I have too much brake dialed in?

    I'm running a Tekonsha P3 on an Expedition. I have a 10,000# dual axle dual brake trailer. This is most noticable (or most disturbing) when I have at least 3,000# of stuff in the trailer.

    I'm able to modulate the rig...it isn't unsafe. Just figured I'd ask if it is normal. I have never driven an electric brake trailer before my ownership of this rig.
    Kubota BX2230, FEL, Woods BH, 60" MMM, Bagger, 4' Box Blade, PHD, 8' x 20' 10k# Dovetail Trailer

    Those of you who think you know it all are particularly annoying to those of us who do.

  2. #2
    Super Member
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    Sep 2000
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    6,553

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Start from scratch and level the sensor and set the power.

    Then Jack up the trailer and adjust the brakes. You did know that the trailer brakes are MANUALLY adjusted, unlike car/truck brakes that self adjust to account for wear? (many people don't know this, the trailer seller should go over it but....)

    Still not fixed? Take off the wheels and make sure the magnets can move freely and the drums are true circles with no nasty rust.

    jb

  3. #3
    Veteran Member
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    Mar 2006
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    Ozark Mountains in Arkansas
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    Montana 4940C

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Keith I am not familiar with the P3 but I am thinking about getting one. The last brake controller I had you could set the amount of current going to the brakes will the P3 let you do that ?

  4. #4
    Elite Member
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    Jul 2006
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    4,409
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    Northwest, WA

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Quote Originally Posted by KeithInSpace
    Do I have too much brake dialed in?
    Or maybe drop the level of aggressiveness a little.
    ::Sent from a standard desktop keyboard::

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  5. #5
    Gold Member
    Join Date
    Aug 2005
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    368
    Location
    The Real Maine
    Tractor
    JD3520

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Like John was saying...

    Does your trailer sit idle for extended periods of time? A little rust can make drums awfully sticky... mine sat idle for 5 months, then this spring a buddy borrowed it & ripped the right side wiring loose... (was testing & noticed only one side locked up)

    Anyway, after rewiring, still nothing, pulled the hub apart and rewired it, cleaned it up, sprayed down everything "non-braking" with WD-40 and now it is working better than the other side... now I've got to pull that side apart & do the same.

    We always expect that trailer we don't use much is going to just keep right on working... disuse is right up there with misuse for stuff going south on you though...

    Good luck with it
    browns40




  6. #6
    Elite Member wushaw's Avatar
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    Mar 2005
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    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Check the shoe adjustment on the trailer, if the shoes are way out of adjustment they can go to dragging with little voltage applied.
    Also check to make sure there is no grease on the shoes from a bad seal, that also can cause them to grab even if they are adjusted correctly.
    Kubota L2800HST, Mitsubishi 372, bh75, 45" Agric tiller, 5' home made disk, 42" Bush hog, PHD, 66" Cammond BB.

  7. #7
    Veteran Member KeithInSpace's Avatar
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    May 2006
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    Fred'burg, Virginia
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    Kubota BX2230

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Quote Originally Posted by gemini5362
    ...will the P3 let you do that ?
    Yes, infinitely. Also has 4 levels of "boost" to alter how much the trailer "grabs" at first application of the brakes.

    Works quite well. Can't say that this issue I'm having wouldn't be the case for any controller, so I haven't faulted the P3 yet.
    Kubota BX2230, FEL, Woods BH, 60" MMM, Bagger, 4' Box Blade, PHD, 8' x 20' 10k# Dovetail Trailer

    Those of you who think you know it all are particularly annoying to those of us who do.

  8. #8
    Veteran Member
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    Ozark Mountains in Arkansas
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    Montana 4940C

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    Quote Originally Posted by john_bud
    Start from scratch and level the sensor and set the power.

    Then Jack up the trailer and adjust the brakes. You did know that the trailer brakes are MANUALLY adjusted, unlike car/truck brakes that self adjust to account for wear? (many people don't know this, the trailer seller should go over it but....)

    Still not fixed? Take off the wheels and make sure the magnets can move freely and the drums are true circles with no nasty rust.

    jb
    John I noticed you said to level the sensor. Are you talking about the sensor in the P3. According to the literature that is one of the big selling points of the p3 is that it can be mounted in almost any position. That is one of the reasons I am thinking about getting one.

  9. #9
    Silver Member skipro3's Avatar
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    Jul 2008
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    223
    Location
    Placerville, CA
    Tractor
    Montana 4344

    Default Re: Trailer brakes "bind" in traffic...brake controller "feedback"???

    I'm agreeing with some others that you need to check for brake shoe contamination. Sure sounds like some grease got on the shoe materials. It will lock up a brake until the pressure is reversed; stop and slight roll backwards in sever cases.

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