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I heard that the fluid in the ABS unit never gets close to the heat etc of the brakes so it's ok to just leave it and let it mix w/ the new stuff.
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When the new fluid which has a higher boiling point, assuming you use a DOT4, comes in contact with the older DOT3 (lower boiling point) the old DOT3 fluid instantly boils.
Now, over time and after a few ABS engagements and bleeds the old fluid will be purged, but in the meantime you're mixing the two whenever you engage ABS.
