Yamaha YFM7FGPW Service Manual page 131

BLEEDING THE HYDRAULIC BRAKE SYSTEM
È
2
É
2
• When bleeding the hydraulic brake system,
make sure there is always enough brake
fluid before applying the brake. Ignoring this
precaution could allow air to enter the
hydraulic brake system, considerably length-
ening the bleeding procedure.
• If bleeding is difficult, it may be necessary to
let the brake fluid settle for a few hours.
Repeat the bleeding procedure when the tiny
bubbles in the hose have disappeared.
1. Remove:
• rear wheel
Refer to "FRONT AND REAR WHEELS" in
chapter 8.
2. Bleed:
• hydraulic brake system
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a. Fill the brake master cylinder reservoir to
the proper level with the recommended
brake fluid.
b. Install the diaphragm (brake master cylinder
1 reservoir).
c. Connect a clear plastic hose 1 tightly to the
bleed screw 2.
È Front
É Rear
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully squeeze the brake lever or fully
depress the brake pedal and hold it in posi-
tion.
g. Loosen the bleed screw.
NOTE:
_
Loosening the bleed screw will release the
1
pressure and cause the brake lever to contact
the handlebar grip or the brake pedal to fully
extend.
h. Tighten the bleed screw and then release
the brake lever or brake pedal.
i. Repeat steps (e) to (h) until all of the air
bubbles have disappeared from the brake
fluid in the plastic hose.
j. Tighten the bleed screw to specification.
3 - 50
CHK
ADJ
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Bleed screw
5 Nm (0.5 m · kg, 3.6 ft · lb)
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