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  1. #1
    Dream it, Do it.
    Reputation: Spectre's Avatar
    Join Date
    Jan 2004
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    294

    Amount of expansion for Mineral Oil vs Hydraulic Fluid

    How much does mineral oil expand vs hydraulic fluid? I have XT 775 discs and had a problem with dragging brake pads when the brakes got hot. I seem to have mostly fixed the problem by bleeding out some brake fluid. Will mineral oil expand enough to cause pads to drag?

  2. #2
    mtbr member
    Reputation: canonshooter's Avatar
    Join Date
    May 2009
    Posts
    312
    I also have XT 775 discs...I changed from Shimano Mineral Oil to Pentosin... HUGE improvement in stopping power.

    I had the same issue with my XT's rubbing a bit initially, after switch they are great. No rub. Whether or not it is related to the fluid I dont know.

  3. #3
    I Tried Them ALL... Moderator
    Reputation: Zachariah's Avatar
    Join Date
    Dec 2007
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    4,663
    Yes, but its only temporary and is much friendlier than corrosive DoT fluid. My XTR M965 did it - but when I upgraded to lighter, Magura Marta SL....the issue was non-existant. Magura rules!
    "The mind will quit....well before the body does"

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