I use DOT4 (Castrol LMA) because of the relatively high wet boiling point and it's what Volvo calls for. I would flush it, and be willing to think that no damage was done.
I have never witnessed damage done by DOT3, but there used to be fellows here that said for sure it would damage Girling rubber....I dunno...but you should use DOT4 because it's the brakes we are talking about, and why go against a manufacturer's recommendation, especially in the direction of lower perf?
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http://www.fidalgo.net/~brook4/oilslubesfilters.html
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