Yamaha YZ450F Owner's Service Manual page 146

WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA1DX1007
NOTICE
During installation, bring the brake hose
into contact with the brake master cylinder
projection "a" and make its bent portion "b"
face downward.
TIP
Turn the handlebar toward right and left to
make sure that the brake hose does not touch
other parts (e.g., wire harness, cables, leads).
Adjust if necessary.
3. Pour brake fluid to the brake master cylinder
reservoir up to the specified level.
Recommended brake fluid
DOT 4
EWA13540
WARNING
• Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
• Refill with the same type of brake fluid that
is already in the system. Mixing brake flu-
ids may result in a harmful chemical reac-
tion, leading to poor brake performance.
• When refilling, be careful that water does
not enter the brake master cylinder reser-
voir. Water will significantly lower the boil-
ing point of the brake fluid and could
cause vapor lock.
ECA13540
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
4. Bleed:
• Brake system
Refer to "BLEEDING THE BRAKE SYS-
TEM" on page 3-21.
5. Check:
• Brake fluid level
The minimum level mark "a" or below 
Add.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-26.
6. Check:
• Brake lever free play
Refer to "ADJUSTING THE FRONT
BRAKE" on page 3-22.
• Brake lever operation
A softy or spongy feeling  Bleed the brake
system.
Refer to "BLEEDING THE BRAKE SYS-
TEM" on page 3-21.
4-20
FRONT BRAKE