Bleeding The Hydraulic Brake System - Yamaha YJ125S Service Manual

BLEEDING THE HYDRAULIC BRAKE SYSTEM

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EAS00133
BLEEDING THE HYDRAULIC BRAKE SYS-
TEM
w
Bleed the hydraulic brake system whenever:
8 8 8 8 8 the system is disassembled.
8 8 8 8 8 a brake hose is loosened, disconnected
or replaced.
8 8 8 8 8 the brake fluid level is very low.
8 8 8 8 8 brake operation is faulty.
1. Remove:
8reservoir cap
NOTE:
8 Be careful not to spill any brake fluid or al-
low the brake master cylinder reservoir to
overflow.
8 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 hy-
draulic brake system, considerably length-
ening the bleeding procedure.
8 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.
2. Bleed:
8 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-
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 pres-
sure and cause the brake lever to contact the
throttle grip.
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CHK
ADJ