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BRAKE
LINING REPLACEMENT
The cyclebond
ing
procedure remains the same
as previously
covered in bulletins and the
1954
and
1955
Chrysler
Service Manuals,
except for
the use
of a wider band on the clamping fixture
for the
2
Vt
inch wide lining. and an
increase of
25 percent on
clamping force.
NOTE:
It
is
vet'Y
importa.nt that the equipment
manufacturcl"s instructions
be
cUt"clully
ob-
served
t01- cUI'ing
time, temperature.
and
clamp-
ing preSS1.0"C
(loa
psi),
depending
on
the
type
of equipment
u.~ed.
GRINDING BRAKE LINING
NOTF::
Bmke
shoe
grindi?lg
mu.~t
be done
with
the brake shoes removed /t'om vehicle.
Use the following steps
for proper grinding
of
brake shoe
lining.
(1) Mea::;ure the
drum diameter
with an
ac-
curate
micrometer.
Drum
must
not
exceed
.004
inch
out-of-round
al any poinl
in
the
drom.
(2) The
drum diameter is then
trnnsferred
to
the grinding machine
and
the lining is
ground to the specified
clearance
of .010
to
.024
inch below
drum
diameter.
BRAKE ADJUSTMENT
NOTE:
Wh
eneve1· brakes
have been
relined or
new shoe
assemblies installed, always apply the
brake pedal prior
to
adjusting
the
b1"akes.
This
action causes
the
brake
shoes
to
center
them-
selves in
the brake
d7"1tm
and
assist
in the
ad-
justment.
Front
Brake
Adjustment
Turn each
adjusting cam
(Fig.
10)
on
both
front brakes in the
direction of forward wheel
rotalion
(Fig.
11) until shoe lining
is
solid
against
drum
a nd wheel
is locked.
Turn
adjust-
ing cams slowly
in
t he
opposite
direction
(each
cam a
little at
a
time) until no
drag is
felt.
Rear Brake
Adjustment
The
rear brake adjustment
procedure
is the
same
as outlined
for previous
shoe-type
brakes.
The forwa
rd r
ear
wheel
shoe
adjusting cams
are rotated
in
the
direction of forward wheel
rotation. The
rear
wheel
shoe udjusting
cnms
are rotated
in
the
direction of r
everse
wheel
rotation (Fig.
11).
12
Fig. 10
-
Adjusting Broke
Shoe
At (om
LEFT
FR
ONT
f6\
\U
LEFT REAR
U
~~l(
70B
RIGHT FRONT
(0\
~
RIGHT
REAR
C)
Fig.
11
-
Adjusting Front and Rear Brake
Shoes
(Orientation
Diagram) (As
Viewed Benealh Vehicle)
BRAKE POWER UNIT
A
neW,
non-reactionar
y pedal
assist
type brake
boosler
(bellows type)
with
complete
new
brake linkage will
be
used
in
Models
C-71,
C-72,
C-73,
C-70 and C-72-300.
DESCRIPTION
The
new bellows type
booster
unit
is
an
oval-
shaped
air vacuum bellows mounted on the
en-
gine
side
of the
dash panel
and is
connected
mechanically to
the
brake
pedal
linkage through
the power
unit push
rod,
as shown in
Figure
12.
Through the
vacuum
source
con
nection,
vac-
uum
from
the
intake
manifold
is admitted
to
the a
ir-vacuum
bellows
(during
brake applica-
tion
)
through
the
vacuum valve.
Air (atmosphere)
enter
s
the
unit
through
the
built-in
a
ir
cleaner and is
regulated
by the
air valve.
The valve
operating rod
,
which is
controlled
by the
brake
pedal, controls the
oper·
ation
of
the
a
ir valve
and
spring. The
bellows
•
1
l
•
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