Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

2018 LT Int Brakes pulsating, sometimes not working great.

Discussion in 'International Forum' started by Leeroy_brown, Feb 20, 2022.

  1. Feb 20, 2022 #1
    Leeroy_brown

    Leeroy_brown Bobtail Member

    12
    22
    May 13, 2017
    0
    2018 LT and wabash trailer. All drums and shoes were replaced a few months ago. but now the brakes are pulsating, similar to what happens with a car when the rotors are warped. Bad enough that while coming to a stop, you can see the trailer bouncing up and down in the mirror. Kinda sketchy at highway speeds, big vibrations on harder braking. Sometimes feels like it doesn’t even want to work at all. Like the ABS is kicking in rapidly on/off/on/off.
    anyone have this problem before? might it be a valve or relay of some kind. An ABS controller/sensor?
    Any thoughts would be appreciated.
     
    Leeroy_brown, Feb 20, 2022
    Leeroy_brown, Feb 20, 2022
    #1
    Another Canadian driver Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Feb 21, 2022 #2
    Professor No-Name

    Professor No-Name Road Train Member

    4,023
    7,779
    Nov 26, 2016
    0
    Whenever the brakes on my tractor have done that the shop replaced my steer drums and it took care of it. They said the drums were warped. I've had it do that on a new truck so obviously the drums were faulty from the start as they didn't last. Maybe you got some faulty parts. They take a little while before they start warping early. Get those parts looked at an go from there at other possible problems.
     
    Professor No-Name, Feb 21, 2022
    Professor No-Name, Feb 21, 2022
    #2
  4. Feb 21, 2022 #3
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

    738
    938
    Jan 11, 2022
    0
    Sounds like the air is not being dumped evenly.
    Where does the vibration feel like it's starting from?
     
    Keepforgettingmypassword, Feb 21, 2022
    Keepforgettingmypassword, Feb 21, 2022
    #3
  5. Feb 21, 2022 #4
    Leeroy_brown

    Leeroy_brown Bobtail Member

    12
    22
    May 13, 2017
    0
    Feels like it’s the trailer only, I don’t really bobtail so can’t be sure. what do you mean “dumping evenly”?
     
    Leeroy_brown, Feb 21, 2022
    Leeroy_brown, Feb 21, 2022
    #4
  7. Feb 21, 2022 #5
    LoneRanger

    LoneRanger Road Train Member

    3,689
    9,590
    Jun 3, 2018
    0
    I’ve had a similar issue, and the trailers brakes needed adjustment. That solved it. Something to do with distribution of air I believe.
     
    LoneRanger, Feb 21, 2022
    LoneRanger, Feb 21, 2022
    #5
  8. Feb 22, 2022 #6
    Keepforgettingmypassword

    Keepforgettingmypassword Heavy Load Member

    738
    938
    Jan 11, 2022
    0
    My terminology is always off. I was trying to say the air released from the brakes. One of the lines may have a tiny leak causing a uneven air pressure release when you hit the brakes.
    But even this didn't come out right I don't think.
    Another thing. When was the last time the fifth wheel was greased.
    A dry fifth wheel caused a lot of weird stuff for me. Always take my advise last. I'm usually wrong, but I try.
     
    Keepforgettingmypassword, Feb 22, 2022
    Keepforgettingmypassword, Feb 22, 2022
    #6
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.