Yamaha YZF-R125, Service Manual

Page: 93 / 356

CHASSIS
3-20
3. Hold the vehicle upright and apply the front
brake several times.
4. Check:
• Brake hose
Brake fluid leakage
→
Replace the damaged
hose.
Refer to “FRONT BRAKE” on page 4-17.
EAS21290
CHECKING THE REAR BRAKE HOSE
1. Check:
• Brake hoses “1”
Cracks/damage/wear
→
Replace.
2. Check:
• Brake hose holder “2”
Loose connection
→
Tighten the holder bolt.
Loose or open holder
→
Fasten properly.
3. Hold the vehicle upright and apply the rear
brake several times.
4. Check:
• Brake hoses
Brake fluid leakage
→
Replace the damaged
hose.
Refer to “REAR BRAKE” on page 4-28.
EAS21350
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
WARNING
EWA13100
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.
NOTE:
• 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 cylinder
reservoir or brake fluid reservoir).
c. Connect a clear plastic hose “1” tightly to the
bleed screw “2”.
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
1
2
1
2
A. Front
B. Rear
2
1
A
2
1
B
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