Honda CRF250F Owner's Manual Installation And Operation page 141

Rear Brake
Brake Fluid Level:
With the motorcycle in an upright position,
check the fluid level. It should be above the
LOWER level mark (1). If the level is at or
below the LOWER level mark, check the
brake pads for wear (page 78).
Worn pads should be replaced. If the pads
are not worn, have your brake system
inspected for leaks.
The recommended brake fluid is Honda
DOT 4 brake fluid from a sealed container,
or an equivalent.
16
(1) LOWER level mark
Other Checks:
Make sure there are no fluid leaks. Check
for deterioration or cracks in the hoses and
fittings.
(1)