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Since you don't want to mix it, how do you tell what type brake fluid (DOT 3/4 vs 5) your system has in it other than to put some on a rag and see if shines the hood or takes the paint off??!! :p ::
 

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your hood idea may not be far off, as far-fetched as this is you could spray paint a piece of wood or metal or something and test the brake fluid on that.

If that is too impractical then i don't know another way to do it.

Sorry if that isn't much help
 

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I'd just bleed it out and fill it up fresh. Then you know what you have. This is a good thing to do from time to time anyway. Get's rid of the moisture and helps the other components last longer.
 
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