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Brake Proportion Valve, and slow reation from the brakes.

Discussion in 'Ask An Owner Operator' started by ProfessionalNoticer, Nov 4, 2021.

Page 2 of 3
  1. Nov 4, 2021 #11
    JoeyJunk

    JoeyJunk Road Train Member

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    I’m glad this came up. I just bought a 98 FLD120 and it does same thing. I haven’t picked up my trailer yet so I wasn’t sure how it would be then. Bobtailed from LA to PA and back and forth to a few shops. Have to get hard on the brakes and the rear axle starts to lock up.
     
    JoeyJunk, Nov 4, 2021
    JoeyJunk, Nov 4, 2021
    #11
    Rideandrepair and ProfessionalNoticer Thank this.
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  3. Nov 4, 2021 #12
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Connect both your red and blue glad hands together and release both red and yellow brake valves when bobtailing as a bandaid until you decide what to do about it.
     
    ProfessionalNoticer, Nov 4, 2021
    ProfessionalNoticer, Nov 4, 2021
    #12
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  4. Nov 4, 2021 #13
    JoeyJunk

    JoeyJunk Road Train Member

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    I have a Fleetpride 20 miles away and 29 miles the other way so I may just do this. It’s most likely the original valve so I wouldn’t mind putting a fresh one in.
     
    JoeyJunk, Nov 4, 2021
    JoeyJunk, Nov 4, 2021
    #13
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  5. Nov 4, 2021 #14
    JoeyJunk

    JoeyJunk Road Train Member

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    Dec 31, 2010
    Washington, PA
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    JoeyJunk, Nov 4, 2021
    JoeyJunk, Nov 4, 2021
    #14
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  7. Nov 4, 2021 #15
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    So take that small line off (control port) and cap it and move the larger one that's next to into the smaller (control) port where the smaller line was?

    IMG_20211104_150732620.jpg
     
    ProfessionalNoticer, Nov 4, 2021
    ProfessionalNoticer, Nov 4, 2021
    #15
  8. Nov 4, 2021 #16
    wichris

    wichris Road Train Member

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    That looks like the rear service valve
     
    wichris, Nov 4, 2021
    wichris, Nov 4, 2021
    #16
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  9. Nov 4, 2021 #17
    wichris

    wichris Road Train Member

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    The picture i posted was just a generic valve.
     
    wichris, Nov 4, 2021
    wichris, Nov 4, 2021
    #17
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  10. Nov 4, 2021 #18
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    That's the only valve I have other then the small on the front axle that I know of.
     
    ProfessionalNoticer, Nov 4, 2021
    ProfessionalNoticer, Nov 4, 2021
    #18
  11. Nov 4, 2021 #19
    wichris

    wichris Road Train Member

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    The one you want will have two "hot" lines in. One constant and one supplied by releasing the trailer brakes. You want to "fool" the valve that the trailer brakes are released all the time. The other line is the "control" line from the pedal.
     
    wichris, Nov 4, 2021
    wichris, Nov 4, 2021
    #19
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  12. Nov 4, 2021 #20
    wichris

    wichris Road Train Member

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    Can't tell from the picture if there are 2 hot lines.
     
    wichris, Nov 4, 2021
    wichris, Nov 4, 2021
    #20
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