LBS should have it - chain reaction sell it too pretty cheap. Sorry cant post urls yet but go to chain reaction cycles dot com and search for dot 5.1Looks like DOT 5.1 is common between my old Juicys, Elixirs on my son's bike and my XX brakes. Do I get it from the bike store or the auto parts store?
Auto parts stores will have Dot 3 and 4. I haven't found dot 5.1 in the auto parts stores checker, pep boys et al. I went to a performance motorcycle shop. I think it was $10 a quart. You could always just use dot 4 instead. It is compatible with 5.1 and 3, it just has a lower boiling point than 5.1. Remeber Dot 5 is NOT compatible.