Hopefully you landed here after reading our other article, What Brake Fluid is Best for my Motorcycle?. If so, you know the difference between DOT 3, DOT 4, DOT 5, and DOT 5.1 brake fluid. Without getting too far into it, DOT 5.1 is the best all-around choice for modern motorcycles that spec DOT 3 or 4 fluid. Since DOT 5.1 has a lower viscosity than it’s predecessors, it’s especially good for modern ABS-equipped motorcycles.
Best DOT 5.1 Brake Fluid for Your Motorcycle.
Best All-Around: Bosch ESI6-32N Brake Fluid
While it’s not really one you’d want to run on track day, as the dry boiling point is a below-average 500 degrees, it’s more than adequate for the street. To make up for the lackluster boiling point, Bosch ESI6-32N absorbs less moisture from the air than standard brake fluids (Lasts 100% longer than DOT 3, 50% longer than DOT 4, and 10% longer than DOT 5. 1), so your brake fluid stays cleaner longer, and your brake system stays corrosion-free.
Best DOT 5.1 Brake Fluid for Performance: Motul DOT 5.1
No list of the best brake fluid would be complete without at least mentioning Motul’s offerings. Their RBF660 fluid (mentioned in our Best DOT 4 Brake Fluid article) is a staple among motorcycle racing enthusiasts. The Motul DOT 5.1 brake fluid doesn’t have quite as high of a boiling point as the 660, but it’s more than enough for your average track day or a spirited ride through the nearest canyon.
Runner Up: Maxima Racing Brake Fluid
With a dry boiling point of 516 degrees, this Maxima Racing fluid will take whatever you can throw at it. Advanced chemistry resists corrosion, oxidation and is compatible with SBR, EPDM and natural rubbers so your brake system seals stay in good shape. Maxima is a trusted name in performance motorcycle fluids. They also make some of the best motorcycle engine oil!
Do you have a favorite DOT 5.1 brake fluid? Tell us which one and why by leaving a comment below!