Yamaha YZ450F Owner's Service Manual page 71

c. Tighten the locknut.
Locknut:
6 Nm (0.6 m •kg, 4.3
ft•lb)
Be sure to tighten the locknut, as it
will cause poor brake perfor-
mance.
CHECKING AND REPLACING THE
FRONT BRAKE PADS
1. Inspect:
• Brake pad thickness "a"
Out of specification → Replace as
a set.
Brake pad thickness:
4.4 mm (0.17 in)
<Limit>: 1.0 mm (0.04
in)
2. Replace:
• Brake pad
Brake pad replacement steps:
a. Remove the pad pin plug "1".
b. Loosen the pad pin "2".
c. Remove the brake caliper "3"
from the front fork.
d. Remove the pad pin and brake
pads "4".
e. Connect the transparent hose "5"
to the bleed screw "6" and place
the suitable container under its
end.
f. Loosen the bleed screw and push
the brake caliper piston in.
Do not reuse the drained brake flu-
id.
g. Tighten the bleed screw.
Bleed screw:
6 Nm (0.6 m•kg, 4.3
ft•lb)
h. Install the brake pads "7" and pad
pin.
• Install the brake pads with their pro-
jections "a" into the brake caliper re-
cesses "b".
• Temporarily tighten the pad pin at
this point.
3-15
CHASSIS
i. Install the brake caliper "8" and
tighten the pad pin "9".
Bolt (brake caliper):
28 Nm (2.8 m•kg, 20
ft•lb)
Pad pin:
18 Nm (1.8 m•kg, 13
ft•lb)
j. Install the pad pin plug "10".
Pad pin plug:
2 Nm (0.2 m•kg, 1.4
ft•lb)
3. Inspect:
• Brake fluid level
Refer to "CHECKING THE
BRAKE FLUID LEVEL" section.
4. Check:
• Brake lever operation
A softy or spongy feeling → Bleed
brake system.
Refer to "BLEEDING THE HY-
DRAULIC BRAKE SYSTEM" sec-
tion.
CHECKING AND REPLACING THE
REAR BRAKE PADS
1. Inspect:
• Brake pad thickness "a"
Out of specification → Replace as
a set.
Brake pad thickness:
6.4 mm (0.25 in)
<Limit>: 1.0 mm (0.04
in)