High performance DOT 5.1 brake fluid designed specifically for mountain bike disc brakesThe formula created gives maximum fluid life to ensure the best braking performance is maintained for as long as possibleDOT 5.1 is 100% compatible with systems that run DOT 3 and DOT 4, and comfortably exceed their performance specificationsA full replacement of oil is recommended if upgrading from DOT 3 or DOT 4 oilUltra low-viscosity oil gives excellent operation even in the most extreme riding conditionsThe chemical additives contained within the Finish Line Dot 5.1 brake fluid spread moisture through the complete system to increase the boiling temperature, which stops the moisture pooling in the calliper body and allows the brakes to operate up to 270 CWhatever the weather, brakes filled with Finish Line brake fluid will stop you on a dime