F
BRAKES,
WHEELS
AND
TIRES
SECTION
FI
THE
DISC
BRAKE
The
disc brakes
are
of
a standard type,
the
disc
being bolted
Lv
the
hub, and
the
braking pads
hydrauilcaliy
operated
from a caliper housing,
bolted
to.t~e
left side fork leg at
the
front
wheel,
and
to
the
anchor
plate on
the
right side
of
the
rear
wheel.
Pipelines, (partly rigid and partly flexible),
convey
the
operating
fluid from
the
operating
control
to
the
caliper,
the
master
cylinder and Fluid
reservoir,
In
the
case
of the
from
brake, being
combined
in
a unit on
the
handlebar. Caliper,
pipelines, and master cylinder, etc., are of Lockheed
manufacture.
For
the
rear
brake,
the master
cylinder
15
mounted on
the
right side chain stay,
and
15
operated
by
the foot brake pedal.
The
fluid
reservoir.
In
this
case,
Is
located beneath the
cwlnseat.
..
SECTION
F2
MAINTENANCE
Mechanical adjustment
is
not
necessary, and
the
braking
system
is
designed
to
be self adJusting;
conseGuently, only minimal maintenance
Is
reGulred.
The
life
of
the
brake
pads wlli vary with mileage
and
operating
conditions,
but
during
this
time,
it
should
not
be necessary
to
replenish
the
fluid level
in
the
reservoir, hence
the
level will
fali
slightly
as
the
brake pads
wear.
The fitting
of
new pads,
described on page
F4,
wili restore the fluid
to
Its
orlglnallevel.
Other
essential maintenance
Is
to
the
pipeline
union nuts,
ali
of
which must be checked
at
regular
Intervals for signs of fluid leakage. The union
bolt
at
the
handlebar pipeline connection
15
concealed
beneath
a
rubber
cover (on U.S.A. models).
The
bleed nipple also reGuires checking for tightness.
SECTION
F3
THE
DISC
The
ten
Inch
diameter
disc
is
made
of
close-grained
cast-Iron, With
the
braking surface
hard-chrome
plated.
It should reGuire no maintenance
other
chan
when renewal becomes necessary due
to
~amage,
such
as
excessIve scoring.
fo
replace
the
disc, first remove
the
wheel.
For
:he
front
wheel, see Section
F15,
and for
the
rear
;ection
F17.
Jnscrew
the
four
securing nuts, and detach
the
disc.
:heck
that
the
Joint face on
the
hub, and also on
the
ew
disc,
Is
completely clean,
then
fit
the
new disc
2
and tighten
the
nuts diagonaliy opposite
to
each
other.
Replace
the
wheel, and attach a
dial
test Indicator
to
the
forkleg, and check
the
run-out on
the
disc.
The
maximum reading should not exceed
..
0035 In.
(.089 mm).
If
It
is
outside
the
limit, the disc
should
be
reposItioned.
In
an
attempt
to
obtain a
more
satisfactory combination
of
machining limits.
Excessive
run-out
of
the
brake disc moves
the
pistons
back Into
the
bores,
and
creates
excessive
lever
travel
when
the
brake
Is
applied,
thus
the
run-out
must
be
kept
to
the
specified minimum.
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