Honda TRX250TE 2019 Owner's Manual page 149

Fluid Level Inspection
Refer to Safety Precautions on page 97.
With the ATV in an upright position, check the fluid level.
It should be above the LOWER level mark (1).
If the fluid is below the LOWER level mark, have your dealer add the
recommended fluid.
Do not add or replace brake fluid, except in an emergency. Use only
fresh brake fluid from a sealed container. 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.
RIGHT HANDLEBAR
(1) LOWER level mark
Brakes
(1)
Servicing Your Honda 139