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  1. #1
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    Hayes 9XC won't maintain pressure

    I have Hayes 9 XC brakes and after a nasty spill the front brake lost pressure. After not seeing any fluid leaking from the system, or near the spot of the crash, and not seeing any visible signs of breakage or failure I was stumped.

    I bought a bleed kit and attempted to bleed the front brake. I followed the directions, but I noticed that everytime I manipulated the lever more air bubbles would appear. When I thought they were all gone I closed the system but it would never build pressure.

    I checked what I was doing by bleeding the rear brake. Sure enough, I had no troubles and the rear brake worked fine.

    I'm left to wonder if during that crash the bike came down on the front brake lever possibly damaging something on the inside. Again, there's nothing damaged as far as I can tell from the outside. Is it possible for the lever/plunger to be damaged and let the smallest amount of air in without letting out fluid? Is the problem elsewhere?

    I need help!

  2. #2
    ride hard take risks
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    How old are the brakes??
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  3. #3
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    3 years old. I don't ride a tremendous amount, and the pads are still in great shape.

  4. #4
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    Quote Originally Posted by SKTrekFuel7
    3 years old. I don't ride a tremendous amount, and the pads are still in great shape.
    Sounds like the master failed on impact, time for a rebuild.

    http://www.hayesdiscbrake.com/pdf/HF...68BEnglish.pdf

    Another possibility is the compression fitting may be loose or barb unseated.

    http://www.spadout.com/p/hayes-hfx-9...serts-10-each/
    Last edited by dogonfr; 10-10-2008 at 06:43 PM.
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  5. #5
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    I kind of suspected that. Thanks!

  6. #6
    ride hard take risks
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    Quote Originally Posted by SKTrekFuel7
    I kind of suspected that. Thanks!
    Check the nut first just be careful the nut is very thin and will round off. If the nut is snug go to the LBS for a barb and compression fitting and give that a shot, you will need to bleed the system.

    As a warning the barb can be a pain in the arz to remove, if it is then just cut the hose to the end of the old barb then install the new pieces.
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