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Trailer brakes locking up even with a slight brake application

Discussion in 'Trucks [ Eighteen Wheelers ]' started by roxbo, Mar 24, 2022.

Page 2 of 3
  1. Mar 24, 2022 #11
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    What was original friction material?
     
    spsauerland, Mar 24, 2022
    spsauerland, Mar 24, 2022
    #11
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  3. Mar 24, 2022 #12
    brysol01

    brysol01 Medium Load Member

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    Nov 2, 2009
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    I was experiencing that with a dry van , what do you have for a tractor? It was a valve up on the firewall That caused it,
     
    Last edited: Mar 24, 2022
    brysol01, Mar 24, 2022
    brysol01, Mar 24, 2022
    #12
  4. Mar 24, 2022 #13
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Maybe tee a pressure gauge into the service line to the chambers. One on the truck and
    What are XEM shoes?
     
    BoxCarKidd, Mar 24, 2022
    BoxCarKidd, Mar 24, 2022
    #13
  5. Mar 24, 2022 #14
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Check to be sure it has the correct drums also. We have had some that the pilot hole in the drum was to large for the hub. That caused the drums to be off center and cause the problem you describe.
     
    BoxCarKidd, Mar 24, 2022
    BoxCarKidd, Mar 24, 2022
    #14
    spsauerland Thanks this.
  7. Mar 24, 2022 #15
    bigguns

    bigguns Road Train Member

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    Omega,GA
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    XEM = OEM Typo?
     
    bigguns, Mar 24, 2022
    bigguns, Mar 24, 2022
    #15
    BoxCarKidd Thanks this.
  8. Mar 24, 2022 #16
    spsauerland

    spsauerland Road Train Member

    4,296
    10,890
    May 31, 2010
    West Harrison, In
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    XEM is Freuhauf style I believe, 4515XEM.
     
    spsauerland, Mar 24, 2022
    spsauerland, Mar 24, 2022
    #16
    BoxCarKidd and bigguns Thank this.
  9. Mar 24, 2022 #17
    bigguns

    bigguns Road Train Member

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    Jun 13, 2013
    Omega,GA
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    Posts concerning wheels locking up and having people asking why seems to be a common thing anymore.
     
    bigguns, Mar 24, 2022
    bigguns, Mar 24, 2022
    #17
  10. Mar 25, 2022 #18
    roxbo

    roxbo Bobtail Member

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    Mar 24, 2022
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    Not sure about the friction material, but the manufacturer said trailer needs 4707 Q Plus shoes.
     
    roxbo, Mar 25, 2022
    roxbo, Mar 25, 2022
    #18
  11. Mar 25, 2022 #19
    roxbo

    roxbo Bobtail Member

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    Mar 24, 2022
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    Do you know what valve they replaced? The only valve that is mounted to the firewall on my truck is the throttle valve.
     
    roxbo, Mar 25, 2022
    roxbo, Mar 25, 2022
    #19
  12. Mar 25, 2022 #20
    roxbo

    roxbo Bobtail Member

    15
    17
    Mar 24, 2022
    0
    will do, thanks
     
    roxbo, Mar 25, 2022
    roxbo, Mar 25, 2022
    #20
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