NEW BRAKES....DOT 5?

I think the "worse" was implied rather than state when it was mentioned that Dot 5 doesn't absorb water and therefor would allow water to rust any iron components. Whether it does that and causes rust, or, in using Dot3/4 which does absorb water and causes rust, seems to me as a distinction without a difference and with the same result. I agree, in that respect, they're just different. The benefit of the Dot 5, IIRC, is the boil temp rating and that it won't harm paint. The drawback is the extra cost and maybe a lack of supply in some places.