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How do you adjust electric trailer brakes?

Discussion in 'Trucks and Trailers' started by kandklandscape, Apr 7, 2008.

  1. kandklandscape

    kandklandscape LawnSite Senior Member
    from PA
    Messages: 341

    I hear there is a magnet inside the drum, and then a set screw?

    When you apply the brakes on the truck the trailer locks up. When you turn the left turn signal on it locks up and then unlocks, locks and unlocks etc etc

    Checked it on 3 different trucks and it does it on all three. Of course there is a wire crossed for the left signal problem.

    However does anyone have a diagrahm with how to set elec brakes on a trailer? Etrailer.com has some good help sections but cannot find this one.

    Also we tried adjusting the gain on the elec brake controller.

    Any help would be appreciated. I think the trailer is a PJ trailer
  2. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    First, get the electrical problem fixed! You really can't adjust the brake controler properly otherwise. Sounds like your taillight is grounding out on the trailer frame causing your brakes to pulse.

    If the brakes are locking up when you push the brake pedal, then your brake controler is set too high. Is your trailer loaded with equipment or empty? If you pull it both loaded and unloded you will need to adjust it some each time or else it won't have enough brakes when it's loaded, and will lock when it's unloaded.

    As for adjusting the brakes themselves, there's a brake adjustment tool you will need, you can find one at about any auto parts store. There's a oblong hole on the back side of the brake plate, usually capped with a little plastic plug. It's almost best to have someone that's done it before (knows what they are doing) to show you how to do it. In short, you will want the wheel off the ground, adjust the cogged dial adjuster until you can just feel/hear the brake pads dragging a little.
    If they are locking up, sounds like they are working pretty good, lol.

    Hope this helps some... Like I say, get the brakelight fixed and out of the equation first...
  3. kandklandscape

    kandklandscape LawnSite Senior Member
    from PA
    Messages: 341

    Easy fix, went over wiring and found out the idiots who wired it back up wired the left turn with the brake. We just traced all the lines and tested and got her working good now! Thanks for the help!

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