PERIODIC
MAINTENANCE
2-17
AIR BLEEDING THE
BRAKE
FLUID CIRCUIT
Air
trapped
in the
brake fluid
circuit
acts
like
a
cushion
to
absorb
a
large proportion
of the
pressure developed
by the
master cylinder and thus interferes
with
the
full
braking perfor-
mance
of
the brake caliper.
The
presence
of
air
is
indicated
by
"sponginess"
of the
brake lever
and
also
by
lack
of
braking
force.
Considering
the
danger
to
which such trapped
air
exposes
the
machine
and
rider,
it is
essential
that,
after
remounting
the
brake
and
restoring
the
brake system
to the
normal condition, the brake fluid
circuit
be
purged
of air in the
following
manner:
•
Fill the master cylinder reservoir to the top
of
the inspection
window.
Replace the reservoir cap to prevent
dirt
from enter-
ing.
•
Attach
a
hose to the air bleeder valve, and insert the free end
of the hose into
a
receptacle.
•
Squeeze
and
release the brake lever several times
in
rapid
succession
and
squeeze
the lever fully without releasing
it.
Loosen the air bleeder valve
by
turning it
a
quarter
of a
turn
so that
the
brake fluid runs into
the
receptacle, this
will
remove the tension
of
the brake lever causing it to touch the
handlebar grip. Then, close the air bleeder valve, pump
and
squeeze
the lever, and open the valve.
Repeat
this process
until
the fluid flowing into the receptacle
no
longer contains
air
bubbles.
NOTE:
While bleeding the brake system, replenish the brake
fluid
in
the reservoir as necessary. Make sure
that
there is always
some
fluid
visible in the reservoir.
T—l—
"•Hi
•
Close
the air bleeder valve, and disconnect the hose. Fill the
reservoir
with
brake fluid to the top
of
the inspection window.
H Air bleeder valve: 7.5 N m (0.75
kgf-m,
5.5
Ib-ft)
A
CAUTION
Handle
brake
fluid
with
care: the
fluid
reacts chemi-
cally
with
paint,
plastics, rubber materials, etc.
BRAKE
HOSES
Inspect every 2 000 km (1 200 miles, 6 months).
Replace every
four
years.
•
Check the brake hoses
for
leakage, cracks, wear and dam-
age. If any damages are found, replace the brake hoses
with
new ones.
•
When
replacing
the
brake hoses, remove
the
front fender.
(C^
3
7-6)
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