Mixing brake fluid brands? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 6 (permalink) Old 05-16-2017, 08:04 PM Thread Starter
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Mixing brake fluid brands?

I have a 2006 V-Star 1100. I'm about to do a brake bleed and will likely need to add brake fluid during the process. The Clymers manual says to always use DOT 4 brake fluid but goes a step further and says to always use the same brand of brake fluid and to never mix brands, as there may be something different between the two brand formulas. Is this really a concern?
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post #2 of 6 (permalink) Old 05-16-2017, 08:10 PM
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Originally Posted by openair View Post
I have a 2006 V-Star 1100. I'm about to do a brake bleed and will likely need to add brake fluid during the process. The Clymers manual says to always use DOT 4 brake fluid but goes a step further and says to always use the same brand of brake fluid and to never mix brands, as there may be something different between the two brand formulas. Is this really a concern?
DOT#4 is DOT#4 no matter who makes it

dumb bikers don't get to be old bikers
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post #3 of 6 (permalink) Old 05-17-2017, 01:24 PM
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I think the bigger concern is why would you have two different brands - ie. is one an old bottle you have lying around? If it is an open bottle you should dispose of it and use a fresh bottle as brake fluid is hygroscopic and will go bad.

Joel

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post #4 of 6 (permalink) Old 05-17-2017, 02:08 PM
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I would do a total flush if it were me. Does not take long then the problem if mixing is solved. :-) BTW I just did this on mine.

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post #5 of 6 (permalink) Old 05-17-2017, 02:21 PM
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from what the manual is saying you would have to assume the factory put Yamaha brake fluid in the bike at the factory

and

thou shall not mix brands = you must buy Yamaha brake fluid

unless you drain out all the old stuff.

I agree with Pauli Dot4 is Dot4.

If it bothers you drain it all out - there is no way a flush can be a bad thing.
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post #6 of 6 (permalink) Old 05-17-2017, 05:42 PM Thread Starter
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Thanks everyone! Much appreciated. Sounds like pretty much nobody thinks mixing different brands of DOT 4 is a problem. I might do a brake flush, but if it's not a problem to mix brands, then it's not a problem.
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