Bleeding The Hydraulic Brake System - Yamaha MIO Service Manual

BLEEDING THE HYDRAULIC BRAKE SYSTEM

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NOTE:
_
• Be careful not to spill any brake fluid or allow
the brake master cylinder reservoir to over-
flow.
• 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. Bleed:
• hydraulic brake system
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a. Fill the brake fluid reservoir to the proper
level with the recommended brake fluid.
b. Install the brake master cylinder reservoir
diaphragm.
c. Connect a clear plastic hose 1 tightly to the
bleed screw 2.
d. Place the other end of the hose into a con-
1
tainer.
e. Slowly apply the brake lever several times.
f. Fully pull the brake lever without releasing
it.
g. Loosen the bleed screw.
NOTE:
_
Loosening the bleed screw will release the
pressure and cause the brake lever to contact
the throttle grip.
h. Tighten the bleed screw and then release
the brake lever.
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.
k. Fill the brake fluid reservoir to the proper
level with the recommended brake fluid.
Refer to "CHECKING THE BRAKE FLUID
LEVEL".
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Bleed screw
6 Nm (0.6 m · kg, 4.3 ft · lb)
CHK
ADJ
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