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  1. #1
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    XT disc Question

    How do I lube my pistons? Only one side seems to be operating properly.

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    Quote Originally Posted by Wilson10
    How do I lube my pistons? Only one side seems to be operating properly.

    I believe the mineral oil is supposed to lubricate them.

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    Senior Member Jim311's Avatar
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    I saw some XT discs at an online retailer for 65 bucks!! I was so close to snatching them up even though they are a Shimano product.
    My money pits:

    Cannondale Jekyll 500 with Avid Mechs and Sun DS2 rims with XT disc hubs.

    Cannondale F900 with SRAM XO shifters/derailler, Mavic X3.1 tubeless wheels, Avid Mechs, Race Face Next LP cranks, Time ATAC pedals, SRAM levers.

  4. #4
    Fool O' crap sscyco's Avatar
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    Quote Originally Posted by Jim311
    I saw some XT discs at an online retailer for 65 bucks!! I was so close to snatching them up even though they are a Shimano product.
    Where?

  5. #5
    Senior Member Jim311's Avatar
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    My money pits:

    Cannondale Jekyll 500 with Avid Mechs and Sun DS2 rims with XT disc hubs.

    Cannondale F900 with SRAM XO shifters/derailler, Mavic X3.1 tubeless wheels, Avid Mechs, Race Face Next LP cranks, Time ATAC pedals, SRAM levers.

  6. #6
    Senior Member Jim311's Avatar
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    They only have the front brake on sale for 65, and it doesn't include a hose. But I'm sure you can find the rear XT disc brake for 100 bucks or less somewhere online.
    My money pits:

    Cannondale Jekyll 500 with Avid Mechs and Sun DS2 rims with XT disc hubs.

    Cannondale F900 with SRAM XO shifters/derailler, Mavic X3.1 tubeless wheels, Avid Mechs, Race Face Next LP cranks, Time ATAC pedals, SRAM levers.

  7. #7
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    DON'T LUBRICATE THE PISTONS!

    You'll contaminate the pads and render your brakes useless!

    The DOT or Mineral Oil does in fact lubricate as it works.

    With many disc brakes, only one side moves anyways. The outside piston is the one that moves, The inside one is fixed and the outside piston pushes the rotor in toward the fixed one.
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
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    Ok, but in my case the inside pistons on the inside are the ones moving. thoughts? should i just leave it be

  9. #9
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    Front brake?

    Probably, I was thinking (picturing in my head) my rear Hayes brake. Anyways, only one moves!

    I'd just leave it.

    If you're having problems with stopping power, I'd first replace the pads. I use EBC Gold pads and it completely improved my braking performance.

    L8R
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

  10. #10
    Senior Member SS_MB-7's Avatar
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    Quote Originally Posted by Wilson10
    How do I lube my pistons? Only one side seems to be operating properly.
    I have XTR discs and have sticky pistons in both the front and rear calipers. Mine are now back at Shimano for warranty. This is a known issue with some of the XTR calipers in which the inner piston bore surface is too smooth for the piston seals to grab the surface. Newer version have slightly rougher surfaces.

    I tried everything to get my pistons to work, but ultimately, it was just a waste of time.

    Curiously, I spoke with both Shimano USA and Shimano Canada. Shimano USA said to lube the pistons, but didn't specify what lube. This was also written-up on Velonews.com. However, Shimano Canada advised against lubing since it will attract dirt. But, they did say, if you are going to lube, use Shimano Mineral Oil, which is in the system, and not TriFlow, etc. So, if you do lube, make sure you clean-up any excess. Shimano Canada also recommended thoroughly cleaning the pistons with White Lightening Clean Streak.

    Ride Hard,
    Mike B.
    http://www.one-speed.com

  11. #11
    Senior Member SS_MB-7's Avatar
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    Quote Originally Posted by a2psyklnut
    DON'T LUBRICATE THE PISTONS!

    You'll contaminate the pads and render your brakes useless!

    The DOT or Mineral Oil does in fact lubricate as it works.

    With many disc brakes, only one side moves anyways. The outside piston is the one that moves, The inside one is fixed and the outside piston pushes the rotor in toward the fixed one.
    Depends who you talk to...Shimano USA or Canada. USA says to lube the pistons, but Canada advises against it.

    Yes, if you aren't careful, you can get fluid on your pads when lubing the pistons. So, I'd recommend removing the wheel and pads and then gently extending the pistons by gently pulling the lever. Don't pull too hard, too fast or too hard because the pistons can pop-out.

    Actually, very few, if any, are single-piston. Most brakes are now dual piston. The older Magura Louise were single-piston, but are now dual.

    Ride Hard,
    Mike B.
    http://www.one-speed.com

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