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Weak brakes on the drive axle

Discussion in 'Trucks [ Eighteen Wheelers ]' started by olpa77, Apr 26, 2012.

Page 3 of 3
  1. May 6, 2012 #21
    olpa77

    olpa77 Light Load Member

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    Apr 9, 2011
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    I replaced the service relay valve and it did not correct the problem. I backed the pads off just to see if they were glazed, they looked fine. Checked the LSV and it did not have a line that went to the rear axle relay, just air bags only. A friend of mine who used to work on the old FLD's told me to replace a check valve that is attached to the foot petal. He said it controls something when bobtailing and could be stuck. I just replaced it tonight. I will have to take it out in the morning and see if it fixes it. Not 100% sure what that valve does but the old valve seemed to be sticking when I tested it.
     
    olpa77, May 6, 2012
    olpa77, May 6, 2012
    #21
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  3. May 6, 2012 #22
    windsmith

    windsmith Road Train Member

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    Sep 2, 2011
    NEPA
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    If you gauge the pressure on both axles' chambers and it is equal, then the only thing left is contaminated shoes, IMO.

    Not sure if it would contribute to this issue, but check to make sure that the springs in your spring brakes aren't broken. They'll still work, but will have less effectiveness and may be part of the problem.
     
    windsmith, May 6, 2012
    windsmith, May 6, 2012
    #22
  4. May 6, 2012 #23
    olpa77

    olpa77 Light Load Member

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    Apr 9, 2011
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    When it was in the shop they put a gauge on the the truck and the trailer. They told me they were close but not the same. If the vavle I just replaced does not correct the problem then I guess the shoes will be next.
     
    olpa77, May 6, 2012
    olpa77, May 6, 2012
    #23
  5. Aug 31, 2013 #24
    Rawze

    Rawze Medium Load Member

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    818
    Jun 29, 2013
    inmytruck
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    mine did that when truck was new. I got tired of it and tried something just to see if it would fix it,...It did. Now brakes are really nice and smooth and linear. This is what I did...

    I went down a really long steep grade in neutral with a fairly heavy trailer, riding the brakes until they smoked like mad, then threw it in gear and used the jakes the rest of the hill.

    500,000 miles later, I replaced the pads (got a free set for buying 10 tires), brakes are still working great.
     
    Rawze, Aug 31, 2013
    Rawze, Aug 31, 2013
    #24
  7. Jan 20, 2014 #25
    Rooivalkpilot

    Rooivalkpilot Bobtail Member

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    Jan 16, 2014
    0
    make sure the air is releasing from the trailer fast enough. air fittings between truck and trailer sometimes slows down the service air releasing from the trailer side when brakes are disengaged. the trailer brakes might be dragging a little.
     
    Rooivalkpilot, Jan 20, 2014
    Rooivalkpilot, Jan 20, 2014
    #25
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