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Bleeding The Brake Line - Kawasaki KX125 1990 Service Manual

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Filling up
the
Brake line
1.
Open the
bleed
valve
.
2.
Apply the brake and
hold
it.
3.
Close the
bleed
valve with
the
brake
held
applied.
4. Then quickly
release
the
brake.
Bleeding the
Brake
Line
The
brake
fluid has
a very
low
compression coef-
ficient so that almost all
movement
of the brake
lever
or
pedal
is
transmitted
directly to the
caliper
fo
r
brak-
ing action
.
Ai r,
however,
is easily
compressed.
When
air enters the
brake
lines,
brake
lever
or
pedal
move-
ment
wi
ll
be
partially
used in compressing the
air.
This
will
make
the
lever
or
peda
l
feel spongy, and
there will be a loss in braking
power.
Bleed the
air from
the brake
whenever
brake lever
or pedal action
feels
soft or spongy, after
the
brake
fluid is
changed, or whenever a brake
line
fitting
has
been loosened for
any
reason
.
-
Remove
the reservoir
cap, and check that there is
plenty of flu id in the
reservoir.
NOTE
oThe fluid level must be checked often during the bleed-
ing operation and replenished as
necessary.
olf
the
fluid
in
the reservoir runs almost out any time
during bleeding, the bleeding operation must be done
over again from
the
beginning since air
wiIJ
have
entered the line.
-
With the
reservior
cap off, slowly
pump the
brake
lever
or pedal several times
until no
air bubbles can
be seen
rising up
through the
fluid from
the
holes
at
the
bottom of the
reservoir.
This bleeds
the
air from
the
master
cylinder end of the
line.
BRAKES
10-
15
NOTE
oTap the brake hose lightly from the caliper to the
reservoir for easier
bleeding.
-Install the
reservoir
cap, and connect a
clear
plastic
hose to
the
bleed valve at the caliper.
-
Run
the
other end of the plastic
hose
into a container.
-Pump the brake lever or pedal a few times
until
it
becomes
hard
and then,
holding
the
lever
or pedal
squeezed,
quickly
open (turn counterclockwise) and
close
the
bleed
valve.
-Release the
brake.
-Repeat this operation
until
no more
air can be seen
coming out
into the
plastic
hose.
-Remove the clear
plastic hose.
-Tighten the bleed valve to the specified torque, and
install
the
rubber
cap.
Tightening Torque
7 .8N-m (0.8
kg-m,
69
in-lb)
-Check that the brake
fl
uid is fi lled
to
the
upper
level
line marked
in
the
reservoir (with the master cylinder
held
level).
-
After
bleeding is done,
check the brake for weak
braking
power,
brake
drag, and fluid
leakage.
Bleedtng
the
Brake
Une
~
(
o
1.
Pump
the brake lever or pedal until
it
becomes hard,
and
hold
the brake
applied.
2.
Quickly open and
close
the
bleed
valve with the
brake held
applied.
3.
Release
the
brake.

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