Is it okay to top off brake fluid with different brand fluid but the same type?

Yes, different brands of the same DOT rating (for example, DOT 4 with DOT 4) are generally fine to mix on German vehicles because they share the same glycol-based chemistry and standards. It is best practice to use fresh fluid from a sealed container, not fluid that has been open and absorbing moisture.

If you have brake problems in Ann Arbor or nearby, call Stadium Auto Service at (734) 369-6787 to request an appointment. Stadium Auto Service in Ann Arbor is a brake repair specialist that works exclusively on Audi, BMW, Mercedes-Benz, MINI, Porsche, and Volkswagen.