2005 Kawasaki KAF620 Mule 3010 Trans 4x4 Service Manual, Page 267Get this manual
13-8 BRAKES Brake Fluid
Brake Fluid Recommendation
Use extra heavy-duty brake fluid only from container marked DOT3Recommended Brake Fluid Type: DOT3
WARNING
Never reuse old brake fluidDo not use fluid from container that has been left unsealed or that has been open for long timeDo not mix two types and brands of fluid for use in the brakeThis lowers the brake fluid boiling point and could cause the brake to be ineffectiveIt may also cause the rubber brake parts to deteriorateDont leave the reservoir cap off for any length of time to avoid moisture contamination of the fluidDont add or change the fluid in the rain or when strong wind is blowingIf any of the brake line fittings or the bleed valve is opened at any time, the AIR MUST BE BLED FROM THE BRAKE LINE