My dad used to work for BASF. Apart from the tapes you might know them from they are one of the largest chemical companies on the planet. The plant he worked in made brake fluid. Depending on the customer they filled drums labeled BASF, Castrol, ATE etc. The only difference was the dye some of them had put in. Any DOT 4 fluid is good.
Use whatever you put in the brake circuits. I've been using Brembo DOT 5.1 recently, simply because I bought some being sold cheap (I know that you can't use DOT 5 which is silicone based). I don't ride in a way that would mean that the higher boiling point of 5.1 would be noticeable!
