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8-2
DESCRIPTION
BRAKES
(246)
Series 40-50
Items
Percentage
of Total B
raking
Power on-
Front
Wheel Brakes
.
Rear
Wheel
Brake s
.
Static Pressure in Hydraulic
System
when Brakes are Released
.
53
47
6-8Ibs.
Series
70
53
47
6-8Ibs
.
I"
c. Adjustme nt Specifications
Brake Pedal Clearance at Toeboard
,
with Push Rod Ag
ainst
Stop
.
.
.
. .
.
. .
I"
~learance
at Both Ends of Secondary Lining with Primary Shoe Seated
Against Drum
. . . . .
.
.
. .
.
. .
.
.
. . .
. . .
.
.
.
.
.
.
.
. .
. . .
.
.
.
.
. . . .
.
.
. .
.
.
.
.
.
~Cf------ .015 ":±
.
00 2
"---
-~
~djusting
Screw
Setting,
from Point
whe re
Wheels Can Just be Turned
by Hand
. .
.
.
.
. . .
.
. .
.
.
. .
.
.
.
.
. .
.
.
.
.
. .
. . .
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.
. .
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.
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.
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.
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.
.
C
Back
Off-
-
--
---+
C
15-17 Notches
~
d. Brake
Drums
Brake Drum
Material
.
lns ide Diameter
.
.
. .
.
.
.
Maximum Allowable
Rebore
.
Maxim um Allowable
Runout of Braking
Surface,
New or After Rebore
.
Maximum Allowable
Out-of-Round,
Before Rebore
.
Maximum
Allowable Out-of-Balance
.
e
.
Hydraulic Brake
Syst e m
\pproved Hydraulic Brake Fluid
.
"luid
Level,
Below Top of Filler Opening
.
Master Cylinder Size
.
Nheel Cylinder Size, Front
.
Rear
.
"
f.
Brake Shoes and
Linings
-(--C.l.
Rim Fused to
Steel
Flange----+-
C
11
.997"
to
12.003"
~
C
.060" oversize
~
.005"
.005"
.010 "
.010"
C
6 in
.
oz
.
~
~-G
.M.
or
Delco
Super No.9--+-
~
Y2"
to I
"
~
I
"
1"
lYs"
lYs"
1"
I"
2
2
~Self E nergi zin g
,
Internal Expanding-+-
Molded
Molded
1
%
"
x
U6"
2
7,4"
X
U6"
9
1 Yt 6 "
10"
12
%"
12
1
% "
158.7
206.4
.005"
.005"
'lumber of Brake Shoes at Each Wheel
.
~rake
Shoe Type
.
~rake
Lining, Type
.
Width and
Thickness
.
Length-Primary
.
Length-Secondary
.
Total Area
/Car
(sq
.
in
.)
.
vIaximum
Allowable
Space Between Lining and Shoe Rim After Riveting
..
vIaxim
um
Allowable
Space
Between Lining and Drum when Shoe is Tested
in Drum
.
.004"
.004 "
~-2
DESCRIPTION O
F BRA KES
The
brake
mech
anism
includes a hydrauli-
.ally operated service br ake system and a me-
.hanically
operated
parking brake
system. The
iydraulic
service brake system simultaneously
.pplies the
brake
shoes at all four wheels;
the
larking brake system applies the brake shoes
~t
rear wheels only.
Either
brake system can
be
.perat ed independently of the other. See
figure
\-2.
a. Wheel Brake
Ass embly
The brake assembly at each wheel uses a
primary (front) and a secondary (rear) brake
shoe of welded steel
construction
with molded
lining attached by tubular rivets. The rim of
each brake shoe is slotted n
ear
the edge t
o pre-
vent
squeaks.
See figure 8-1.
The
brake
shoes are retained at the upper
ends
by an anchor pin and shoe guide mounted
on t
he
brake
backing
plate, and heavy coil
.
/- SLO
TS,
__
~
0
0
'~-()-'--
Figure
8- I-Slotted Brake Shoe
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