Yamaha Raptor 90 YFM90RA 2011 Service Manual page 78

BLEEDING THE HYDRAULIC BRAKE SYSTEM
TIP
• Be careful not to spill any brake fluid or allow
the brake master cylinder reservoir or brake
fluid reservoir to overflow.
• When bleeding the hydraulic brake system,
make sure there is always enough brake fluid
before applying the brake. Ignoring this pre-
caution could allow air to enter the hydraulic
brake system, considerably lengthening 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
a. Fill the brake fluid reservoir to the proper
level with the recommended brake fluid.
b. Install the diaphragm (brake master cylin-
der reservoir or brake fluid reservoir).
c. Connect a clear plastic hose
the bleed screw
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake lever several times.
f. Fully squeeze the brake lever and hold it in
position.
g. Loosen the bleed screw.
TIP
Loosening the bleed screw will release the
pressure and cause the brake lever to contact
the 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 REAR BRAKE
FLUID LEVEL".
WARNING
After bleeding the hydraulic brake system,
check the brake operation.
3 - 26
CHK
ADJ
tightly to
.
5 Nm (0.5 m•kg, 3.7 ft•lb)