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Thread: Hayes 9 fluid

  1. #1
    Klaatu Barata Niktu
    Reputation: thealmightywes's Avatar
    Join Date
    Dec 2008

    Hayes 9 fluid

    Is it true that i need some kind of special fluid for these, or can I just use mineral oil? all of the threads i've seen say either one or the other, and im not sure.

  2. #2
    mtbr member
    Reputation: 006_007's Avatar
    Join Date
    Jan 2004
    Do not use mineral oil in a Hayes system. All Hayes brakes use DOT 3 or DOT 4 fluid.

    Here is a link to the Hayes nine manual.

    Also, let us know where these threads are saying to use mineral in Hayes - we gotta correct that.....

    Some manufacturers do use mineral oil - Shimano and Magura (ok, they use their own "magura blood" which is essentially a mineral oil).

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