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  1. #1
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    Reputation: ndbike's Avatar
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    Juicy Ultimates Dirty Fluid

    Has anyone else had this problem? My Juicy Ultimates where new last August and worked great all fall. About a month ago or so, I bled them and the fluid was super DIRTY. I mean junk floating around in the fluid dirty. Last week I could tell I was losing power in my rear brake so I checked and replaced the pads and bled them again out of curiosity. Again, the fluid was nasty dirty. I flushed the system out completely and bled them with new clean DOT 5.

    So what gives? Why so much dirt in the lines? I had a set of Juicy 7's for 2 years prior and never had this problem.

  2. #2
    Meh.
    Reputation: XSL_WiLL's Avatar
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    Did you use DOT 5 or DOT 5.1? If you used DOT 5, your brake is probably dead.

    I've seen it happen before. I flushed all of it out and it wasn't a problem after.

  3. #3
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    Quote Originally Posted by XSL_WiLL
    Did you use DOT 5 or DOT 5.1? If you used DOT 5, your brake is probably dead.

    I've seen it happen before. I flushed all of it out and it wasn't a problem after.
    I'll have to double check but I think it was DOT 5. It's the same as a friend of mine has been using and he doesn't have the dirty fluid issue.

    • So what's the difference between DOT 5 and DOT 5.1?
    • Why the dirty fluid then with the original factory installed fluid?
    • Why is my brake dead, it seems to work ok since the second bleed but I don't want to have to bleed them every 2 months. I never had to do that the my Juicy 7's.


    Thanks!

  4. #4
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    - DOT 5.1, 4, and 3 are all water soluble. DOT 5 is silicon based and not water soluble, I heard it eats your seals too.
    - Y your fluid has crud floating in it beats me
    - Y is your brake dead - maybe b/c u used DOT 5, i'm not sure. "dead" isn't a very good description of what's going on... spongy lever, stuck lever, leaky whatever are all more specific

  5. #5
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    Quote Originally Posted by vk45de
    - DOT 5.1, 4, and 3 are all water soluble. DOT 5 is silicon based and not water soluble, I heard it eats your seals too.
    - Y your fluid has crud floating in it beats me
    - Y is your brake dead - maybe b/c u used DOT 5, i'm not sure. "dead" isn't a very good description of what's going on... spongy lever, stuck lever, leaky whatever are all more specific
    Thanks for the extra info. I can't say I have spongy or stuck leaver or even leaky brakes. The problem is it gets full of dirt some how and then I need to bleed again. Once bled they're great for about 2 months, or so has been my experience since the last bleed.

    Thanks again.

  6. #6
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    Reputation: GiantMartin's Avatar
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    I run Ultimates and have no problems. Fluid is slightly darker for about a split second right around the caliper when bleeding then turns to golden yellow. Never any dirt.
    2007 Giant Anthem 1
    2009 Giant XTC 0

  7. #7
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    Brakes are an enclosed system, nothing can get in, and the brakes still work properly, period. The off color and dark matter in the brake fluid is from a seal or o-ring wearing. Once it wears to much, it needs to be replaced.

  8. #8
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    That's what I thought too. An enclosed system means dirt shouldn't be getting in my brake fluid. So, the degradation of an o ring or seal makes sense.

    On another note about the differences between DOT 5 and DOT 5.1, from what I've read, DOT 5 is ALWAYS a bluish purple color. The fluid I put in is definitely a gold color. I'm living in Spain now and I've also read that finding true DOT 5 in Europe is very difficult so the labeling on my bottle of brake fluid could be a case of the Europeans not correctly using the names for American Standards. The bottle of fluid also says is complies to UNE 26-106-88, SAE J 1703, ISO 4925 and INTA 157113 D. I'm pretty sure what I've got in my hands is actually a DOT 5.1 and not DOT 5 because of the color. Also, it cleaned up easily with water as a water soluble fluid should.

    Thanks for the advice. I'd appreciate any more insight anyone can provide. Thanks!

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