Dot 5 vs 5.1
Robert makes a good point. While I've had better luck with DOT 5 Silicon fluid and seals myself I can't stress enough that 5.1 and 5 are completely different beasts. 5.1 is more like DOT 4 and is not silicon based. And it will remove your paint too. See the link below for more details....However, its my understanding that DOT 5.1 fluids are compatible with "all brake components", whereas DOT 5 fluids are labeled as "containing silicon and NOT compatible with some brake materials." In addition, I think most new brake component seals, including OH elements for Alfas, are compatible with all brake fluids now...