Motul RBF660 Factory Line brake fluid is a 100% synthetic brake fluid particularly suitable for the demands of racing and for those requiring a high performance brake fluid. This high performance DOT 4 brake fluid is particularly suitable for race applications and exceeds the DOT 5.1 and DOT 3 standards, except for viscosity at - 40°C (-40°F). RBF 600 brake fluid is suitable for all types of hydraulic actuated-brake and clutch systems requiring a non-silicone synthetic fluid. RBF660 is specially designed to resist the high temperature of racing brake (steel or carbon) and clutch systems. 100% synthetic brake fluid from polyglycol bases.