Time for a brake flush. What fluid are people using?

As a default, I'm planning on getting a Motul DOT4, but they have a few different types within that catagory.

Also, my plan is to flush, cycle the ABS unit with the GS911 and then flush again. I bought Speedbleeders to make the job easier.

Motul Dot4 LV (low viscosity) meant for ABS equipped bikes.

Any DOT 4 brake fluid will work, last a long time and you won't see any difference in performance.

I'm using Amsoil's Dominator dot4 race fluid, replacing it annually. This choice is largely due to convenience.

https://www.amsoil.com/p/dominator-dot-4...6%20Protectants

I just use Prestone DOT4 fluid. That it’s synthetic is all that really matters.

Zitat von Paul911 im Beitrag #1

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, cycle the ABS unit with the GS911 and then flush again..

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Zitat von TriangleRider im Beitrag #7

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Zitat von Paul911 im Beitrag #1

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, cycle the ABS unit with the GS911 and then flush again..

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What does this accomplish?

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[/quote]I'll add one other step I'm going to do. I'm going to put the new brake fluid under a vacuum. My father has done this (MIT educated engineer who worked in the defense industry his whole career) and he's found when he's done it with new fluid, dissolved air comes out. [/quote]


Wow sounds like a fun day for the dedicated tinkerer! Post some pics of the transfusion equipment set up when you do the operation!

Cheers!

My local shop said there's an inconsequential amount (ml's) of fluid in modern pumps and cycling it is typically of little value if there's no concern air exists in the line. Their take is with regular maintenance and fluid changes, it'll cycle through without the added step.

that said, it can't hurt of course.

Zitat von jimbob im Beitrag #9

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Zitat von Paul911 im Beitrag #8

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My father has done this (MIT educated engineer who worked in the defense industry his whole career) and he's found when he's done it with new fluid, dissolved air comes out.

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Zitat von zer0netgain im Beitrag #12

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Zitat von Paul911 im Beitrag #8

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My father has done this (MIT educated engineer who worked in the defense industry his whole career) and he's found when he's done it with new fluid, dissolved air comes out.

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Isn't air inherently dissolved?

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You said the process would push out “dissolved air.” I don’t think air is a substance that will dissolve. I can see the process forcing out what I’d call “micro bubbles” (looks a little like foam instead of big, visible bubbles) or the process pushing out contaminated fluid hiding in the nooks and crannies of the ABS unit. I flush with a lot more fluid than I probably need. If I see even the tiniest of bubbles, I keep going until a whole reservoir comes out clear.

Zitat von zer0netgain im Beitrag #14

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You said the process would push out “dissolved air.” I don’t think air is a substance that will dissolve. I can see the process forcing out what I’d call “micro bubbles” (looks a little like foam instead of big, visible bubbles) or the process pushing out contaminated fluid hiding in the nooks and crannies of the ABS unit. I flush with a lot more fluid than I probably need. If I see even the tiniest of bubbles, I keep going until a whole reservoir comes out clear.

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