What is this fibrous material in brake fluid/system?

Discussion in 'Trials' started by StuInFH, Nov 8, 2013.

  1. motobene

    motobene Motoing for 44 years

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    Being wrong doesn't bother me because being wrong is how we iterate getting it right.

    Unwillingness to be wrong is the major human boneheadedness. Tesla invented, patented, and demonstrated wireless communication, radio, but he got obsessed at being wrong about transmitting high amperage power through the air. He was so obsessed he didn't do his calculations. J.P. Morgan, who financed his huge transmission tower in New York that sent wireless signals throughout the universe was misled by Tesla, who was working instead on his obsession. J.P. got pissed, pulled his money, and backed Marconi. Tesla died a pauper.

    Still not sure what exactly I'm wrong about on this one, but I am smiling! Honest!

    Vacuum engineering can suck. When I did silicone molds or when designing and prototyping computer-controlled hydraulic feet, I'd de gas the fluids, the silicone and the hydraulic oil, in a vacuum chamber. It astounded me how the materials would froth up and for how long. Regarding the silicone, the stuff would froth and froth and froth. Finally, I'd get bored and shut off the vacuum with, "Enough already!" But I found all that show didn't do much, practically, because my molds and feet weren't operating 'in a vacuum.'

    But why are we talking vacuum?

    There is no vacuum going on in hydraulic brake systems, just pressure, from atmospheric when the system is open to the reservoir, then more pressure when the lever is pulled in. What gasses are in solution won't mysteriously come out, and if a tiny bit that is out goes back in under pressure, it'll come right back out when you release the lever. It's only escape is back through the reservoir port.

    Still wondering how the mystery stuff leaks out when the lever is zip tied.
    And still smiling! :lol3

    It's all good :clap
    #21
  2. motobene

    motobene Motoing for 44 years

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    I too like to de gas with a belch or two:freaky Just don't want my jaw zip tied shut over night! Might make me fart in bed more, which is bad for marital bliss:wink:
    #22
  3. laser17

    laser17 Been here awhile

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    I guess you didnt read the post above where I explained what I thought was happening. In the meantime, I ran another experiment that had to be repeated again and again.
    #23
  4. laser17

    laser17 Been here awhile

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    +1:clap
    #24
  5. motobene

    motobene Motoing for 44 years

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    That's possible. I thought I did, but I'll go back and check to be sure. Gotta go now though, so I'll have to do it tomorrow or later.
    #25
  6. Rockcat

    Rockcat LDA

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    StuInFh - did your brake make it through your event?
    #26
  7. StuInFH

    StuInFH Been here awhile

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    Finally, someone cares about me. ;-)

    (Thanks all, but I'll keep bleeding from the bottom, as it has worked for me for over 40 years now on many different vehicles, which is how I define reproducibility of an experiment.) :-) Not news to me of course, but good info re seasoning and cleaning etc. for those that may benefit. thanks

    To the point: Success!

    Halfway through the 2nd loop the lever completely firmed up and had to be backed off about half of the compensating adjustment I had made. I mentioned this to an old-timer and he said bubbles travel up the line during the night. I said they obviously travel during daylight hours too. ;-)

    Then during the 3rd loop the lever lost even more travel and the brake was almost dragging, costing me a point here and there as I over-braked from just looking at the lever. (to be fair, those points were offset when it got so tight by section 8 that when I almost went over the bars while braking too hard on the backside of a log before running over the tape that I quit using it. I took fingers off the brake AND the clutch and just barely made the downhill 180 turn without running over tape, and went full on whiskey throttle! Nearly parted from the bike but managed to hang on as the momentum carried me over the two bike-length spaced uphill logs and up the hill and out the gate for a clean where I had fived earlier!)

    Enough about my luck, back to science.

    My theory, air bubbles dislodged during riding, which supports my observation that my brake is back to normal. :-) The debris is likely from inner lining of cable (like the old-timer said), due to its composition not matching any other parts in system AFAIK. I'll find out when I cut it open, AFTER it fails for good. ;-)

    But I still wonder something from back in my days during seasoning of new pads and rotors on my Vettes and Porsches (lots more fun to heat up those rotors than a TB's, BTW); do brake rotors really warp, or is that a myth? (google it) cheers and thanks to all
    #27
  8. jonnyc21

    jonnyc21 Trials Ninja

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    Glad to here it started working for you. I would guess if the bits are the inside of the line, that could have caused the bubbles to ketch near the failure point causing the need for the ride to help the bubbles come out?

    Just a guess. And I hope you don't have any moe issues with it.
    #28
  9. Rockcat

    Rockcat LDA

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    Waiting can be painful! You know you need a new brake line...:deal
    #29
  10. baloneyskin daddy

    baloneyskin daddy bikaholic

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    Especially if you grab a handful of brake and it doesn't release. Just replace the line and be safe.
    #30