2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 270Get this manual
12-8 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 deteriorateDon't leave the reservoir cap off for any length of time to avoid moisture contamination of the fluidDon't 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
CAUTION
Brake fluid quickly ruins painted surfaces; any spilled fluid should be completely wiped up immediately