1999 YAMAHA YZF-R7 air bleeding

3 - 27
CHK
ADJ
BLEEDING THE HYDRAULIC CLUTCH
SYSTEM
WARNINGWARNING
Bleed the hydraulic clutch system
whenever:
• the clutch system was disassembled,
• a clutch hose was loosened, discon-
nected or replaced,
• the clutch fluid level is very low,
• clutch operation is faulty.
NOTE:
• Be careful not to spill any clutch fluid
or allow the clutch fluid reservoir to
overflow.
• When bleeding the hydraulic clutch
system, make sure that there is always
enough clutch fluid before applying
the clutch. Ignoring this precaution
could allow air to enter the hydraulic
clutch system, considerably lengthen-
ing the bleeding procedure.
• If bleeding is difficult, it may be neces-
sary to let the clutch fluid settle for a
few hours. Repeat the bleeding proce-
dure when the tiny bubbles in the hose
have disappeared.
1. Bleed:
• hydraulic clutch system
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Fill the clutch fluid reservoir to the
proper level with the recommended
clutch fluid.
b. Install the clutch fluid reservoir dia-
phragm.
c. Connect a clear plastic hose 1 tightly
to the bleed screw 2.
d. Place the other end of the hose into a
container.
e. Slowly apply the clutch several times.
f. Fully squeeze the clutch lever and
hold it in position.
g. Loosen the bleed screw.
NOTE:
Loosening the bleed screw will release
the pressure and cause the clutch lever
to contact the grip.
h. Tighten the bleed screw and then
release the clutch lever.
i. Repeat steps (e) to (h) until all of the
air bubbles have disappeared from
the clutch fluid in the plastic hose.
2
2
1
1

BLEEDING THE HYDRAULIC CLUTCH SYSTEM

3 - 28
CHK
ADJBLEEDING THE HYDRAULIC CLUTCH SYSTEM/
CLEANING THE AIR FILTER ELEMENT
j. Tighten the bleed screw to specifica-
tion.
k. Fill the clutch fluid reservoir to the
proper level with the recommended
clutch fluid.
Refer to “CHECKING THE CLUTCH
FLUID LEVEL”.
WARNINGWARNING
After bleeding the hydraulic clutch sys-
tem, check the clutch operation.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
T R..
Bleed screw
6 Nm (0.6 m • kg, 4.3 ft • lb)
EB303130
CLEANING THE AIR FILTER ELEMENT
1. Remove:
• fuel tank
• air filter case cover
• air filter element
Refer to “FUEL TANK AND AIR FIL-
TER”.
2. Clean:
• air filter element
Apply compressed air to the outer sur-
face of the air filter element.
3. Check:
• air filter element
Damage ® Replace.
4. Install:
• air filter element
• air filter case cover
ACHTUNG:CAUTION:
Never operate the engine without the
air filter element installed. Unfiltered air
will cause rapid wear of engine parts
and may damage the engine. Operating
the engine without the air filter element
will also affect the electronic fuel injec-
tion, leading to poor engine perfor-
mance and possible overheating.
5. Install:
• fuel tank
Refer to “FUEL TANK AND AIR FIL-
TER”.

3 - 36
CHK
ADJ
ADJUSTING THE REAR BRAKE
EB304001
CHASSIS
EB304010
ADJUSTING THE REAR BRAKE
1. Measure:
• brake pedal position
(distance a from the top of the brake
pedal to the bottom of the rider foot-
rest bracket)
Out of specification ® Adjust.
Brake pedal position (from the
top of the brake pedal to the
center of the rider footrest
bracket bolt)
31 ~ 36 mm (1.22 ~ 1.42 in)
a a
2. Adjust:
• brake pedal position
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Loosen the locknut 1.
b. Turn the adjusting bolt 2 in direction
a or b until the specified brake pedal
position is obtained.
WARNINGWARNING
After adjusting the brake pedal position,
check that the end of the adjusting bolt
c is visible through the hole d.
c. Tighten the locknut 1 to specifica-
tion.
WARNINGWARNING
A soft or spongy feeling in the brake
pedal can indicate the presence of air in
the brake system. Before the vehicle is
operated, the air must be removed by
bleeding the brake system. Air in the
brake system will considerably reduce
braking performance and could result in
loss of control and possibly an accident.
Therefore, check and, if necessary,
bleed the brake system.Direction aBrake pedal is raised.
Direction bBrake pedal is lowered.
T R..
Locknut
16 Nm (1.6 m • kg, 11 ft • lb)

3 - 39
CHK
ADJCHECKING THE BRAKE HOSES/
BLEEDING THE HYDRAULIC BRAKE SYSTEM
EB304062
CHECKING THE BRAKE HOSES
The following procedure applies to all of
the brake hoses and brake hose clamps.
1. Check:
• brake hose 1
Cracks/damage/wear ® Replace.
2. Check:
• brake hose clamp
Loose ® Tighten the clamp bolt.
3. Hold the motorcycle upright and apply
the brake several times.
4. Check:
• brake hose
Brake fluid leakage ® Replace the
damaged hose.
Refer to “FRONT AND REAR BRAKES”
in chapter 7.
EB304072
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
WARNINGWARNING
Bleed the hydraulic brake system when-
ever:
• the brake system was disassembled,
• a brake hose was loosened, discon-
nected 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 fluid reservoir to over-
flow.
• When bleeding the hydraulic brake
system, make sure that there is always
enough brake fluid before applying the
brake. Ignoring this precaution could
allow air to enter the hydraulic brake
system, considerably lengthening the
bleeding procedure.
• If bleeding is difficult, it may be neces-
sary to let the brake fluid settle for a
few hours. Repeat the bleeding proce-
dure when the tiny bubbles in the hose
have disappeared.

3 - 40
CHK
ADJ
BLEEDING THE HYDRAULIC BRAKE SYSTEM
1. Bleed:
• hydraulic brake system
t t t t t t t t t t t t t t t t t t t t t t t t t t t
a. Fill the brake fluid reservoir to the
proper level with the recommended
brake fluid.
b. Install the brake fluid reservoir dia-
phragm.
c. Connect a clear plastic hose 1 tightly
to the bleed screw 2.
Front brake
õRear brake
d. Place the other end of the hose into a
container.
e. Slowly apply the brake several times.
f. Fully squeeze the brake lever or fully
depress the brake pedal and hold it in
position.
g. Loosen the bleed screw.
NOTE:
Loosening the bleed screw will release
the pressure 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.
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 specifica-
tion.
k. Fill the brake fluid reservoir to the
proper level with the recommended
brake fluid.
Refer to “CHECKING THE BRAKE
FLUID LEVEL”.
WARNINGWARNING
After bleeding the hydraulic brake sys-
tem, check the brake operation.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
T R..
Bleed screw
6 Nm (0.6 m • kg, 4.3 ft • lb)

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