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  1. #1
    007 is offline
    b a n n e d
    Reputation: 007's Avatar
    Join Date
    Jun 2005

    DOT 5.1 is DOT 5.1 Right?

    I was bleeding my brakes last night whilst dropping in some new pads and managed to dump my bottle of SRAM DOT 5.1

    I had enough to finish the job, but I want to have a replacement bottle on hand. Is all DOT 5.1 the same? The ScRAM stuff works fine, but its EXPEN$IVE at $12 for 4 oz. I also won't buy Finish Line because of reported quality control issues. This basically leaves Automotive/Motorcycle fluids and Motul. Any reason to use one or the other, or just go with whatever?

  2. #2
    Biking Like Crazy!
    Reputation: blcman's Avatar
    Join Date
    Jan 2007
    Dot 5.1 IS Dot 5.1 All the same. Get the cheapest you can find.

  3. #3
    mtbr member
    Reputation: 006_007's Avatar
    Join Date
    Jan 2004
    DOT 5.1 fluid all meets an appropriate 5.1 standard - get whichever one is available at a reasonable price.

  4. #4
    mtbr member
    Join Date
    Nov 2004
    DOT3, DOT4 and DOT5.1 will all work fine.

    If you are racing on a motorcycle and braking at 180mph, then you want DOT5.1.
    Otherwise DOT3 or DOT4 are fine. Don't waste your money on DOT5.1.

  5. #5
    Commit or eat sh!t
    Reputation: Cable0guy's Avatar
    Join Date
    Jun 2007
    Motul supposedly make the best fluids

  6. #6
    I'm Slow
    Reputation: paulrb02's Avatar
    Join Date
    Aug 2009
    5.1 = 5.1
    5.1 is NOT 5, those two are way different

    I heard rumors that avid 5.1 has a little perfume in it, but I can't really smell the difference. Mountain Biking in South Alabama.

  7. #7
    mtbr member
    Reputation: EBasil's Avatar
    Join Date
    Jan 2004
    Motul really is the best and you can get the 5.1 in two colors, yellow and blue. Now why would you care about the color? When flushing: you purge new fluid until you don't see any of the old color. Pretty cool, actually.

    Now, for MTB brake systems, a small can will last you many bleed/flush cycles, but once you get it down there's no reason not to do it every year or sooner.

  8. #8
    mtbr member
    Join Date
    Sep 2008
    Thanks guys for the info on the DOT 5.1 solutions and comparisons.

  9. #9
    mtbr member
    Join Date
    May 2007
    Motul makes few grades of DOT4.
    DOT5.1 with dry boiling point of 521F and a wet boiling point of 365F. ~$10/ 0.5L
    RBF600 with dry boiling point of 593F and a wet boiling point of 420F. ~$20/ 0.5L
    RBF660 with dry boiling point of 617F and a wet boiling point of 400F. ~$30/ 0.5L
    And there is US brand
    Prospeed RS683 with dry boiling point of 683F and a wet boiling point of 439F. ~$40/ 0.5L

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