DOT 4: A refined specification poly-glycol fluid
as fitted to most faster street bikes now produced
DOT 5: Silicone fluid as used in Harley Davidson®
motorcycles and many special high-performance brake systems
BF307: Highly refined DOT 3 Brake Fluid, ideal for racing or high-performance road bikes. Can be
used in all systems specifying DOT 3, but not with silicone