Kubota RTV-X900 Operator's Manual page 70

48 MAINTENANCE
C Brake fluid:
Always use KUBOTA DOT3 GENUINE BRAKE FLUID from a sealed container. If it is not available, you should use only
DOT3 fluid as a temporary replacement from a sealed container.
However, the use of any non-KUBOTA brake fluid can cause corrosion and decrease the life of the system.
Have the brake system flushed and refilled with KUBOTA DOT3 GENUINE BRAKE FLUID as soon as possible.
A Indicated capacities of water and oil are manufacturer's estimate.