HONDA Motorcycle - Manual (Page 32)

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Rear Brake Fluid Level:
With the motorcycle in an upright position,
check the fluid level. It should be between the
UPPER (1) and LOWER (2) level marks. If
the level is at or below the LOWER level mark
(2), check the brake pads for wear(page 92).
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.