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  1. #1
    mtbr member
    Reputation: nato_the_greato's Avatar
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    DOT 5.1 and leaky seals - coincidence?

    I have a set of Formula Oro K-18s. They're from 2008 or 2009, IIRC. The rear brake is internally routed, so when I installed them I had to disassemble and bleed the rear brake. Formula specs DOT 4, but I used Avid 5.1. I went to tune my bike for the season, and found that my rear brake caliper seals were leaking and my pads were soaked with brake fluid. The front brake seals (with the OEM fluid) appear to be fine.

    Is it possible that the 5.1 fluid caused premature damage to my seals? Or is it just a coincidence?
    Former bike mechanic; current idiot.

  2. #2
    thread crapper
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    It's possible yes. IIRC, 5.1 has a little bit different composition than 4 and it could theoretically cause it to eat the seals if they were only capable of dealing with 4.

  3. #3
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    Reputation: RustyIron's Avatar
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    DOT 4 and DOT 5.1 are compatible.

    Your post states that you bled the brakes in 2008 or 2009. It's now 2013. Your brakes are shamefully long overdue for maintenance.

  4. #4
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    How would bleeding the brakes more often maintain the seals?

    Neither my brakes nor myself can feel shame. Would shame help maintain the seals as well? Maybe that's our problem.
    Former bike mechanic; current idiot.

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