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  1. #1
    Senior Member sonnetg's Avatar
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    Hydraulic fluid/Brake maintenance questions..

    Hello folks,

    I have recently purchased a MTB with Avid Juicy Three hydraulic brakes. This "Hrydro" braking system is completely new to me. Can someone fill me up and what sort of yearly maintenance I can expect to do this "Hydraulic" braking system ?

    I normally don't ride my MTB a whole lot; maybe once a month at most. If that is the case do I need to replace the Brake Fluid yearly? How about bleeding and what not? I am assuming the brake pads will last years given how infrequently I ride the MTB?


    Also, are there any sites that shows how to completely overhaul the Hydraulic Brakes?

    I would really appreciate any advice. I really don't want to take it to the LBS just for yearly brake maintenance. I have all the tools I need for yearly tuneups, which i perform myself. ( This MTB is my 4th bike :-)

    Thank you

  2. #2
    Single-serving poster electrik's Avatar
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    You didn't find material on the manufacturer's site? Last i checked there were videos and texts online.

  3. #3
    Senior Member sonnetg's Avatar
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    Nope. This is all I found: http://www.sram.com/avid/products/ju...lic-disc-brake

    I was able to download a pdf manual, but it didn't mention anything about replacing or refilling fluids.

  4. #4
    Senior Member sonnetg's Avatar
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    Here's the manual. It does not mention anything on cleaning and general maintenance.

    http://www.sram.com/_media/techdocs/95-5013-109-000.pdf

    I usually hose it down and store the bike in my store room after each ride. I make sure all the grime and muck is cleaned up after each ride. I have no way of verifying the fluid. If after a year, the hydraulic brakes work fine, do i have to be concerned on replacing or bleeding the fluid? The LBS did recommend to replace the fluid every year, but i highly doubt i would have to.

    Anyone here have the same old brake fluid working for more than a year? I guess that's all i need to know.

  5. #5
    one less horse cryptid01's Avatar
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    Dont sweat it. Service them when you feel that they need it.

  6. #6
    Senior Member sonnetg's Avatar
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    Quote Originally Posted by cryptid01 View Post
    Dont sweat it. Service them when you feel that they need it.
    Yup. It would be nice to hear some real life experiences from MTB folks at this forum, but, i know.. given few occasional rides i do with the MTB, i would have no need to replace the oil yearly. The oil does not expire, but it could gather some moisture overtime.

    Anyhoo...only time will tell how it holds up.

    Thanks.
    Last edited by sonnetg; 03-24-11 at 09:29 PM.

  7. #7
    one less horse cryptid01's Avatar
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    Quote Originally Posted by sonnetg View Post
    It would be nice to hear some real life experiences from MTB folks at this forum
    this one time i had some brakes i didn't bleed for six years and they still worked.

    is that better? it's kind of hard to tell an interesting story about not bleeding your brakes.

  8. #8
    Senior Member sonnetg's Avatar
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    Quote Originally Posted by cryptid01 View Post
    this one time i had some brakes i didn't bleed for six years and they still worked.

    is that better? it's kind of hard to tell an interesting story about not bleeding your brakes.

    That's interesting enough. As long as my brakes don't degrade or leak air, I wont have to bother with bleeding or unnecessarily replace the brake fluid each year. Sometimes i get the feeling the LBS would love you to visit them every month of maintenance!

    Thanks for the vote of confidence.

  9. #9
    Gravity hunter dminor's Avatar
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    Quote Originally Posted by sonnetg View Post
    The oil does not expire, but it could gather some moisture overtime.
    A bicycle's hydraulic brake system is an unvented, completely-sealed circuit (unlike your car, which usually has a vented master cyclinder); so, without exposure to air, there is really no way the fluid could absorb moisture.

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