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  1. #1
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    New question here. Brake fluid, bleed kit question

    I am changing the hoses on my Juicy 7's. There is a cheap bleed kit on ebay that has DOT 4 fluid with it. The Avid kit comes with DOT 5.1 fluid. Whats the difference

    Anyone use the cheaper kit? It is $15 compared to $45 for the official Avid kit.

    I do mostly XC riding. Not much sustained downhill here in Florida.

  2. #2
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    boiling point is different but compatible with dot 3/4

  3. #3
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    As the above post mentions, DOT 5.1 is compatible with 3 and 4, but just so you're aware; NONE of them are compatible with DOT 5 despite the seeming intuitiveness of the naming conventions.
    DOT 3, 4, and 5.1 are non-silicon based fluids. DOT 5 is silicon-based.

    Also keep in mind if you mix 5.1 with any other 3 or 4 fluid, you'll compromise the viscous properties of DOT 5.1
    DOT 5.1 fluid is less viscous than DOT 4. This means a system filled with DOT 5.1 provides quicker lever response, better modulation and faster pad retraction. When servicing, the lower viscosity facilitates bleeding and pad adjustment. DOT 5.1 also experiences less volume change as a result of temperature shift than DOT 4, allowing more consistent braking through a range of temperature.

    To achieve the maximum benifits of DOT 5.1, flush the system first!

    PS; you can go to any performance motorcycle shop and buy a 12oz bottle for <12.00$
    Last edited by FlippinSweet; 02-03-2010 at 10:10 AM.

  4. #4
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    Awesome, thanks!

  5. #5
    I'd rather be riding!
    Reputation: kmacon's Avatar
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    As for the ebay bleed kit, as long as the threaded adapters at the ends of the syringes seal well to the calipers and none of the pieces fall off when you try to use them, the kit will be functional. Nothing magical about it. Just two syringes, tubing, clamps and threaded fittings.

    I have been using dot 4 fluid and personally I can't tell any difference.

    I put my kit together from discarded parts that I had at work.

  6. #6
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    Reputation: Dictatorsaurus's Avatar
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    Anyone considered trying out valvoline synpower synthetic brake fluid?

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