1999 Sterling

Discussion in 'International Forum' started by bullnibler1957, Jul 29, 2011.

  1. Jul 29, 2011 #1
    bullnibler1957

    bullnibler1957 Bobtail Member

    1
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    Jul 28, 2011
    Kansas City, Mo
    0
    I have a 99 sterling and the brakes are acting funny, thought i would ask a few people to see if they had this problem, or any suggestions.
    Ok when im in the city driving it seems to be the best time for this to happen. I apply the service brakes.. about a third of the way down everything works fine. Then the 2/3 the brakes almost completely release. Then the last 1/3 they come on full strength. Im gettin real tired of this truck trying to throw me through the winshield. Im not a young guy, and i like smooth stops. This hasnt happened to me in any other truck, but its got me miffed. Im thinking it could be the foot valve. Any suggestions?:biggrin_2556:
     
    bullnibler1957, Jul 29, 2011
    bullnibler1957, Jul 29, 2011
    #1
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  3. Jul 30, 2011 #2
    Heavyd

    Heavyd Road Train Member

    7,829
    6,279
    Feb 4, 2009
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    Hydraulic or air? Have they been inspected? Have they been properly adjusted?
     
    Heavyd, Jul 30, 2011
    Heavyd, Jul 30, 2011
    #2
  4. Feb 19, 2012 #3
    jab8283

    jab8283 Bobtail Member

    38
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    Jan 16, 2010
    Indiana, U.S.
    0
    Have this checked by a mechanic. To me it sounds like brake foot valve is malfunctioning. For some reason it's sending full pressure to the brake chambers causing immediate lockup. Another train of thought is when you apply brakes, it sends pressure into chambers, then when you let off brake pedal it exhausts that pressure to atmosphere. The possibility exists that it's not exhausting that air pressure correctly holding it in the system which means even after you let off the brake pedal, that pressure is still there and not releasing brakes quickly but rather slowly. The valve causing that is your service brake valve located on a cross-member in the back near your drive axles. If the air can't get out, or get out fast enough then brake application is still active even after your foot left the brake pedal. When it's functioning correctly, as fast as your foot comes off that pedal, the air inside the chambers releases fully and immediately through that service valve in the back of your frame rails attached to the cross-member.
     
    jab8283, Feb 19, 2012
    jab8283, Feb 19, 2012
    #3
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