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  1. #1
    uhhhh
    Reputation: RoDo's Avatar
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    May 2004
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    Did I boil my brake fluid?

    I ride a set of Hayes HFX Comp (plastic master cylinders) that are probably 4 years old. Today on a loooooong steep fireroad descent I was on the brakes for minutes at a time. I stopped to give my hands a quick break and when I started going again the levers pulled almost all the way to the bar with little braking effect. I was able to stop and then I pumped the levers and things went back to normal. This happened again when I stopped one other time.

    What's causing this? Did I boil the fluid? I don't remember the last time the brakes were bled, it was at least 1 year ago probably more.

    Thanks,
    -RD

  2. #2
    mtbr member
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    Quote Originally Posted by RoDo
    I ride a set of Hayes HFX Comp (plastic master cylinders) that are probably 4 years old. Today on a loooooong steep fireroad descent I was on the brakes for minutes at a time. I stopped to give my hands a quick break and when I started going again the levers pulled almost all the way to the bar with little braking effect. I was able to stop and then I pumped the levers and things went back to normal. This happened again when I stopped one other time.

    What's causing this? Did I boil the fluid? I don't remember the last time the brakes were bled, it was at least 1 year ago probably more.

    Thanks,
    -RD
    Had the same thing happen to my Hopes. When i pulled the master cylinder cover off there was solid brown "floaties" in there, I think the floaties temporarily clogged the check valve leaving the lever to just pump into the resevoir. I completely bled the system pumping all the old fluid out and haven't had the problem come back.

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