Adjusting The Rear Brake Light Switch; Bleeding The Hydraulic Brake System - Yamaha YFM70RY Service Manual

EAS21330
ADJUSTING THE REAR BRAKE LIGHT
SWITCH
TIP
The rear brake light switch is operated by move-
ment of the brake pedal. The rear brake light
switch is properly adjusted when the brake light
comes on just before the braking effect starts.
1. Check:
• Rear brake light operation timing
Incorrect → Adjust.
2. Adjust:
• Rear brake light operation timing
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a. Hold the main body "1" of the rear brake light
switch so that it does not rotate and turn the
adjusting nut "2" in direction "a" or "b" until the
rear brake light comes on at the proper time.
Direction "a"
Brake light comes on sooner.
Direction "b"
Brake light comes on later.
2
a
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EAS21360
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
EWA13100
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 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-
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1
b
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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
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a. Fill the brake fluid reservoir to the proper level
with the recommended brake fluid.
b. Install the brake fluid reservoir diaphragm.
c. Connect a clear plastic hose "1" tightly to the
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bleed screw "2".
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1
B
LLL
A. Front
B. Rear
d. Place the other end of the hose into a con-
tainer.
e. Slowly apply the brake several times.
f. Fully pull the brake lever or fully press down
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 lever to contact the
throttle grip or the brake pedal to fully extend.
h. Tighten the bleed screw and then release the
brake lever or brake pedal.
3-24
CHASSIS
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2
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