Bleeding The Hydraulic Brake System - Yamaha Wolverine YX70EPNG Service Manual

TIP
In order to ensure a correct reading of the brake
fluid level, make sure the top of the brake master
cylinder reservoir is horizontal.
EBS30046
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
EWB02800
WARNING
Bleed the hydraulic brake system whenever:
• the system is disassembled.
• a brake hose is loosened, disconnected or
replaced.
• the brake fluid level is very low.
• brake operation is faulty.
TIP
• Be careful not to spill any brake fluid or allow
the brake master cylinder 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. Remove:
• Front wheels
• Rear wheels
Refer to "FRONT AND REAR WHEELS" on
page 4-23.
2. Bleed:
• Hydraulic brake system
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a. Fill the brake master cylinder reservoir to the
proper level with the specified brake fluid.
b. Install the diaphragm (brake master cylinder
reservoir).
c. Connect a clear plastic hose "1" tightly to the
bleed screw "2".
a
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PERIODIC MAINTENANCE
È
1
É
1
A. Front brake
B. Rear brake
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully depress the brake pedal and hold it in
position.
g. Loosen the bleed screw.
TIP
Loosening the bleed screw will release the pres-
sure and cause the brake pedal to fully extend.
h. Tighten the bleed screw, and then release
the brake pedal.
i. Repeat steps (e) to (h) until all of the air bub-
bles have disappeared from the brake fluid in
the plastic hose.
j. Tighten the bleed screw to specification.
k. Fill the brake master cylinder reservoir to the
proper level with the specified brake fluid.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-19.
EWB02810
▼▼▼
WARNING
After bleeding the hydraulic brake system,
check the brake operation.
▲ ▲▲▲ ▲ ▲▲▲ ▲
3-19
2
2
Brake caliper bleed screw
5 Nm (0.5 m·kgf, 3.6 ft·lbf)
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