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Old 11-01-2009, 11:43 AM   #1
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Brake fluid question..

I HAVE used the search feature and have not been able to answer my question, so here goes...

I have already replaced my brake fluid with DOT 4 and I realized after the fact that I apparently had DOT 5 in the system before.

So my question is, "Did I fawk up?"
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Old 11-01-2009, 12:08 PM   #2
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you need to use dot 5.
just suck the fluid out of the res and put in dot 5.

DO NOT get the dot 5 on painted parts since it will eat up the paint.
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Old 11-01-2009, 12:45 PM   #3
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Yea,you ****ed up.
If it were me,I'd get the mixture out of there right now before it has time to start messing up the seals.
Hopefully all you did was add the 4 into the masters instead of bleeding it through the system.If you did bleed it through and it hasn't been in there very long,I think you can flush the system w alcohol and then reinstall the 5.

I'm no expert on this,so you might want to wait till more suggestions are posted.
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Old 11-01-2009, 12:52 PM   #4
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I assumed that the res was just topped off. If it went through the system then you should drain it flush it and refill
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Old 11-01-2009, 01:21 PM   #5
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the dot 4 will not hurt the seals.it will damage any paint it contacts. the dot 5 is less harmfull to paint and that is the reason its recomended in the early rods.the dot 4 performs better than the 5 in that it has a higher boil point and absorbs water better. dont mix the two together but otherwise if your resivoirs are polished or chromed then dot4 is the best.
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Old 11-01-2009, 02:01 PM   #6
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I'm not really after debating which oil is best; I accidentally replaced the DOT-5 with DOT-4.

I can understand that mixing the 2 could be an issue but, considering any residual DOT-5 left behind SHOULD float above the DOT-4 (b/c the 5 is less dense than the 4), then in THEORY, I should be able to give it a few pulls and skim off the DOT-5, right?
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Old 11-01-2009, 02:56 PM   #7
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I suspect you will have a tough time getting ALL of either out of the system once it's mixed without flushing the one you want through the system. Sounds like you need a pressure bleeder to me.
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Old 11-01-2009, 03:04 PM   #8
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I would drain it all out, flush it with denatured alcohol, and then add DOT 5, bleed the system, and add more DOT 5.
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Old 11-01-2009, 03:16 PM   #9
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Quote:
Originally Posted by bproulxvrod View Post
I would drain it all out, flush it with denatured alcohol, and then add DOT 5, bleed the system, and add more DOT 5.


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Old 11-01-2009, 03:42 PM   #10
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Quote:
Originally Posted by bproulxvrod View Post
I would drain it all out, flush it with denatured alcohol, and then add DOT 5, bleed the system, and add more DOT 5.
screw that dot 4!!
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Old 11-01-2009, 03:59 PM   #11
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Quote:
Originally Posted by bproulxvrod View Post
I would drain it all out, flush it with denatured alcohol, and then add DOT 5, bleed the system, and add more DOT 5.
Knowing about the interactions of the fluids, this is the only correct way to resolve the issue. The two fluids are serously like oil and water, two way different types. They each have their own good points but cannot be mixed. Worse case is the brake lever will always feel spongy or may even never give full brake line pressure.

Tech side the seals are the same, its the interaction of the two fluids that make the seals act soft. Over a long peroid of time it will not be reversable. Its not like bleach and amonia, instant, its a slow deal. Still needs to be addressed ASAP.

When its all cleaned out and fresh fluid is reinstalled you shouldnt notice a difference.
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Old 11-01-2009, 05:55 PM   #12
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Old 03-08-2010, 01:51 PM   #13
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How do you know what type of brake fluid is in your resevoirs? I purchased the bike from a previous owner, so have no idea what was in there. The only thing I can say, is I topped it off with DOT 5 because that's what my resevoir caps said to use. As soon as I poured it in, I noticed the DOT 5 is like a purple color. The existing fluid in there was kind of a yellowish brown clear color, sort of like new motor oil.
Any ideas on what I have or what I should do? I haven't ridden the bike since doing this, so it probably hasn't been through the lines yet.
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Old 03-08-2010, 02:01 PM   #14
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Quote:
Originally Posted by abitwar10 View Post
How do you know what type of brake fluid is in your resevoirs? I purchased the bike from a previous owner, so have no idea what was in there. The only thing I can say, is I topped it off with DOT 5 because that's what my resevoir caps said to use. As soon as I poured it in, I noticed the DOT 5 is like a purple color. The existing fluid in there was kind of a yellowish brown clear color, sort of like new motor oil.
Any ideas on what I have or what I should do? I haven't ridden the bike since doing this, so it probably hasn't been through the lines yet.
The DOT 5 is purplish when new. It will turn all kinds of nasty colors as it ages. From purple to , yellow, brown, and green.
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Old 03-08-2010, 02:48 PM   #15
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Originally Posted by o2man98 View Post
The DOT 5 is purplish when new. It will turn all kinds of nasty colors as it ages. From purple to , yellow, brown, and green.
So is it safe to assume I already had DOT5 in my resevoir? Is there any way of easily figuring out what it is? I just don't want to worry about my brakes failing because I accidentally mixed.
Maybe to be sure, I should just flush and start over at the clutch and both brakes?
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