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  1. #1
    007
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    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!
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    Dot 5.1 IS Dot 5.1 All the same. Get the cheapest you can find.

  3. #3
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    DOT 5.1 fluid all meets an appropriate 5.1 standard - get whichever one is available at a reasonable price.

  4. #4
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    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
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    Motul supposedly make the best fluids

  6. #6
    I'm Slow
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    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.
    RideSAMBA.com Mountain Biking in South Alabama.

  7. #7
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    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
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    Thanks guys for the info on the DOT 5.1 solutions and comparisons.

  9. #9
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    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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