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Rear Wheel Brake
Fig. 28 illustrat·es
the
design
of
the
rear
wheel brake.
Brake
shoes 8
bear
with the spherical
nests
against the
heads of
tap,pets
2 and
with the
pressure
areas, on
-cam
5. The
cam
has
a slot
accomodating
equalizer
6.
When the cam with the
-equalizer
a-re
tur-
ned the shoes are not pressed to the .brake drum.
Fig. 28. Rear wheel brake:
I -
adjus
ting taper;
2-
tappet
;
3-
lever
axle;
4 -
lever;
5
-cam;
6 -
equalizer;
7
-lever
screw;
8 -
brake
shoe;
9-
brake
shoe
spring
As
the
friction
linings
wear
out
the
gap between
the brake shoes
and the wheel
drum
increases.
To mainta
in
this gap
within
the re-
qui•
red limits
the
brake
is provided with a wear
compensator
which
is
made as taper
1. The
taper is screwed
in,
as need arises, from the
exter.
n al
side
and
moves
ap
art
tappehs 2 which bring the
brake shoes
closer
to
the drum
and
cam
with equalizer.
Lon gitudinal
gwoves
on
the taper surface are
provided
for
fixing
the
tap
er
,position. The
tap-
pets acted
upon
by springs 9 which
tighten
the
1
brake
shoes enter
these grooves.
The necessity in brake adjustment is
judged
by the
free
travel
of
rear wheel brake lever end.
The free
travel is considered normal if
it
does not
exeed 35
mm. If it exceeds 35 mm,
tha
n
using
a
wrench
with 8 mm
span turn
the protruding square of
Lhe
adjusting
ta.per
clockwie {as it is
shown
in Fig. 30) through one or several fixed
in
-
t ervals
which are
perseptible
by
the ·effort
·required
for its turning.
In
this case the
length of the
rear
draw rod should be
a
djusted
so
as
described below.
The
rear
wheel
brake
draw rod leTIIgth
is
adjus,ted during its
in-
stalling
on
a
motorcycle as
well as
during rep air
operations.
The
front
draw
rod is not to be
adjusted.
The
a
djustment
is
made
with the wheel removed
and
the rear
brake pedal ,pressed
from
below
to the
footstep in
the
following
order:
64
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