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Kawasaki Z250 1981 Service Manual Page 152

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146 MAINTENANCE-CHASSIS
•Close
the bleed
valve,
and fil
l
the
reservoir with fresh
brake flu id.
•Open
the
bleed
valve,
apply the brake
by
the brake
lever
or
pedal, close the valve
with
the
brake held
applied, and then
quickly
release the
lever
or
pedal.
Repeat
this operation
until
the
brake line
is filled
and fluid starts coming out of the plastic hose.
Replenish the fluid
in
the reservoir as often as
nee·
essary to
keep
it
from
running
comp letely
out.
•Bleed
the
air from the lines.
Bleeding the brake
The brake tluid
has
a
very
low compression coef-
ficient so that almost
all
the movement of the brake
lever or
pedal
is transmitted directly
to the
caliper
for braking action. Air, however,
is easily compressed.
When
air enters the brake
lines,
brake lever or pedal
movement
will
be
partially used
in
compressing
the
air.
This
will
make
the lever
or pedal 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
fl
u
id
in the reservoir. The
fluid
level
must
be checked several
times
during
the
bleeding operation
and
replenished
as
necessary. If the
fluid
in
the
reser·
voir runs
completely out
any
time during bleeding,
the
bleeding operation must be done
over
again from
the
beginning since air
will
have entered the
line.
I
WARNING •
When working with the disc brake, observe the
precautions listed below.
1. Never reuse old
brake
fluid.
2. Do
not use flu
id
from
a container
that
has been
left
unsealed or that has
been open for
a long time.
3. Do not mix two
types of fluid
for use in the brake.
This lowers the brake fluid boiling
point
and cou ld
cause
the
brake to be
ineffective.
It
may also
cause.
the
rubber
brake parts
to
deteriorate.
Recommended fluids
are
given
in
the table.
NOTE:The
type
of fluid originally
used in the
disc brake is
not
available in most
areas,
but it
should be
necessary
to
add
very
little
fluid before
the first brake fluid
change. After changing the
fluid, use only the same type thereafter.
Table J11
Recommended Disc Brake Fluid
Atlas Extra Heavy Duty
Shell Super Heavy Duty
Texaco
Super Heavy Duty
Wagner
Lockheed
Heavy
Duty
Castro! Girling-Green
Castro! GT (LMA)
Castro! Disc Brake
Fluid
The correct
fluid
will
come in a can labeled
D.O. T.3. Do not use fluid that does not have this
marking.
•With
the
reservoir
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
bottm of the
reservoir. This
bleeds the air from the
master cylinder
end
of the line.
Bleeding
the
Brake Line
1.
Hold
the brake
applied.
2.
Quickly open and close the
valve.
3.
Release the brake.
4.
Don't leave the reservoir
cap
off
for
any length
of
time to
avoid
moisture contamination of
the fluid.
5.
Don't
change the
fluid
in
the
rain or when a
strong
wind is
blowing.
6. Except
for
the
disc pads and discs, use only disc
brake
fluid, isopropyl
alcohol, or ethyl alcohol for
cleaning
brake parts. Do
not use
any
other
fluid
for cleaning
these parts. Gasoline, motor oil, or
any
other petroleum distillate will
cause
deterio·
ration of
the
rubber parts.
Oil spilled on any part
will
be difficult to
wash
off
completely
and will
eventually reach and
break
down the rubber used
in the disc
brake.
7. When handling the disc pads
or
disc, be careful
that no disc
brake fluid or any oil gets on
them.
Clean off
any fluid or oil
that inadvertently
gets
on the pads or
disc
with a
high
flash·point solvent.
Do not
use
one
which will leave
an oily residue.
Replace
the
pads with
new
ones
if they
cannot
be
cleaned
satisfactorily.
8.
Brake fluid quickly
ruins painted
surfaces; any
spilled
fluid should be completely wiped up imme·
diately.
9. If
any
of the brake
line
fittings or the bleed valve
is
opened
at
any
time, the
AIR
MUST BE BLED
FROM THE
BRAKE.
10.
When installing or
assembling the
disc brake, tight-
en
the
disc
brake
fittings to
the
values given in
Table
Gl. Improper
torque
may cause
the brake
to malfunction.

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Kz350 1981

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