The Finish Line DOT 5.1 Brake Fluid is designed for maximum fluid life and optimal braking performance in bicycle hydraulic systems. Compatible with DOT 3 and DOT 4 systems, it surpasses their performance levels. Featuring ultra-low viscosity oils, it ensures reliable operation even in the coldest conditions. This advanced formula delivers superior brake lever and pad retraction response, making it a top choice for any rider seeking dependable braking in all weather conditions.