CHASSIS/BRAKE
SYSTEM
lll.
Checks,
Adjustments and
Main-
tenance.
A.
Brake control
parts.
1. Adjust
the
stroke at
the
brake
pedal
with a
power
assist
valve
operating
rod,
by
turning this
rod
until
the
valve
plunger
has 5-7
mm
of
travel left before contacting
the
valve
plunger
stopper.
The effective stroke
at the brake
pedal
should
bq
more than 143
mm. lf
less than that, the brakes
will
not retract
adequately and
they could
fade from the constant
heat.
The brakes
should be bled before
each
race,
even
if the system
has
been
recently overhauled.
4. Do
not mix brake fluids, and use
only
fluids with a
high
boiling
Avoid
any water
in
the system.
Even 2-3
percent
water
in the f
luid
will
lower the
boiling
point
suffi-
ciently
to cause a significant
drop
in
efficiency.
Additionally,
it is
strongly
recommended to change
the
fluid before each
race meet-
ing.
Two
master cylinders
are availa-
ble as
competition
parts;
the
15/16"
diameter
version
is
stan-
dard.
For a
harder
pedal
feel or
shorter
stroke,
the
1.0" cylinder
is
an alternative.
B. Front
brakes.
1. Under
normal
racing
use the com-
petition
rotors will last for
about
3,500
miles. The rotors should be
kept free of
rust
or any
of the
black
corrosion
which reduces friction
between the
rotor
and
the
pads.
2.
Whenever replacing
the rotor,
also
replace the
bolts
which secure
it
to the
hub.
3. Under
normal
racing
use
the wheel
bearings
should
last for
about
3,500
miles. Use
molybdenum di-
sulfide
grease,
and change
it
be-
fore every
race.
The competition calipers are con-
sidered
to be a semi-permanent
item
with an
indefinite lifespan.
However,
they must be
replaced
if
overheating
has deteriorated
ther
piston
seals, resulting
in im-
proper
or
incomplete retraction
of the
pistons
into
the
caliper.
Shims
are used to achieve the
re-
quired
equalized clearance, side-
to-side, between the
rotor
and the
caliper.
These shims fit between
the caliper and knuckle, and are
available
in
three thicknesses:
0.2, 0.6
and 0.8 mm. The shims
can be used
singly
or
in combina-
tions to obtain a clearance on
each side,
measured
between
the
rotor
and
the
pads,
or 1.5-2.2
mm.
The
part
numbers
are:
0.2
mm 0813 33 617
0.6mm 0813 33 618
0.8
mm 0813
33 619
6. Whenever
removing the
hub from
the knuckle,
replace the hub
caps
to
prevent
damage
to
the
wheel
bearing
that could
result
from
the
cap coming
off.
7.
The competition brake
pad
can be
used until
it
is
down
to 1 mm thick-
ness.
Generally,
these are the
rac-
ing mileages
to
be expected
from
the
pads:
SS-100
more than
1,000 km
(600
mi)
SS-123
less than 1,000 km
(600
mi)
8. lt
is
always
highly
recommended
to break
in new
pads
for
a
few
laps before
a
race.
4.
5.
2.
3.
5.
6.
37
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