2006 Honda TRX680 Rincon Factory Service Manual, Page 414Get this manual
BRAKE SYSTEM
BRAKE FLUID REPLACEMENTAIR BLEEDING
Do not allow foreign material to enter the system when filling the reservoirForeign material can cause brake system failureAvoid spilling fluid on painted, plastic, or rubber partsPlace rag over these parts whenever the system is servicedBrake fluid will damage these types of materialsUse only DOT brake fluid from sealed containerDo not mix different types of fluidThey are not compatibleMixed fluid types can cause brake system failure