Honda FOURTRAX RANCHER 2019 Owner's Manual page 180

Brakes
Fluid Level Inspection
Refer to Safety Precautions on page 113.
If your inspection indicates a low fluid level, have your dealer add the
recommended fluid.
Do not add or replace brake fluid, except in an emergency. If you do
add fluid, have your dealer check the system as soon as possible.
NOTICE
Brake fluid can damage plastic and painted surfaces. Handle with
care.
Wipe up spills immediately. Avoid brake fluid contact with skin or
eyes. If it comes in contact with your eyes, wash them out with clean
water and immediately call a doctor. If it comes in contact with your
skin, wash with clean water and, if necessary, call a doctor.
170 Servicing Your Honda