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8-18
REPLACEMENTS
BRAKES
(
262)
Figure
B-1 I-Rear Wheel Brake Assembly-Right
b. Relining Brake Shoes
If old brake sh
oes are
to be relined, inspect
shoes for distortion and for looseness between
the rim and web; these are causes for discard-
ing any
shoe.
If shoes are serviceable, be gov-
erned by the following points in installing new
linings:
1. Remove old linings by drilling out rivets.
Punching rivets out will distort shoe rim.
lever (rear only)
.
See figure 8-11.
3. Separate the brake shoes
by
removing ad-
justing
screw
and lock spring. Remove parking
brake
lever
from secondary brake shoe (rear
only). See figure 8-11.
4. Clean all dirt out
of
brake drum, using
care to avoid getting dirt into front wheel bear-
ings. In
spect
drums and replace or recondition
if required
(*par.
8-17)
.
If front drum and hub
is removed, inspect wheel bearings and oil seal
packings and replace faulty parts
(*par.
6-14).
5.
Carefully
pull lower edges of wheel
cylin-
der boots away from
cylinders
and note
whether interior is wet with brake fluid. Fluid
at this point indicates leakage past piston cup,
requiring overhaul of wheel cylinder (*par.
8-18)
.
6. If working at rear wheels, inspect back-
ing plate for oil leak past wheel bearing oil
seals. Correct any leak by installation of new
seals (*par. 5-9).
7. Check all backing plate attaching bolts to
make sure they are
tight.
Clean all rust and
dirt from shoe contact surfaces on
plate,
using
fine emery cloth.
.
c. Installation and Adjustment
1. If working on rear brakes, lubricate park-
ing brake cable
(par.
8-14)
.
2. On rear brakes only,
lubricate
fulcrum end
of parking brake lever and the bolt with Bendix
or Delco Brake Lubricant, or
Lubriplate,
then
attach lever to secondary shoe with
bolt,
spring
washer,
nut,
and Pal nut. Make sure that lever
is free moving. See figure
8-11.
3. Connect brake shoes together with lock
spring, then place adjusting screw, socket, and
nut in position. The socket and star wheel must
be adjacent to primary shoe on front
brake,
and adjacent to secondary shoe on rear
br ake.
4.
Attach brake shoes to backing plate with
hold down
springs,
pin
s,
and cup
s,
at the same
t
ime engaging shoes
wit h wheel cylinder con-
necting
links.
The
primar y
shoe (short lining)
goes
forward.
On rear brakes, connect cable to
parking brake lever and install strut between
lever and primary shoe as installation is made.
See figure 8-11.
5. If old brake shoe return springs are nicked,
distorted, or if doubtful strength it is advisable
to install new ones. Hook springs in shoes and
Thoroughly
clean su
rface
of shoe rim and file
off any burrs or high
spots.
2. Use only
genuine Buick brake lining and
the rivets included in lining package which are
of correct size
.
The rivets must fit the holes and
the solid
body
of rivet should extend through
the shoe rim, but no
farther.
3.
Keep
hands clean
w
hile
handling brake
lining. Do not
permit oil
or
grease
to
come
in
contact with
lining.
4.
Start the
riveting
at center of shoe
and
lining and
work
toward the ends.
Use
~
roll set
for riveting; a star set might split the tubular
end and then the rivet would not fill the hole.
The primary lining is shorter than secondary
lining, therefore the rivet holes at
each
end of
shoe rim are not
used.
5. After riveting is completed, lining must
seat snugly against shoe with no more than
.005" separation midway between
rivets.
Check
with a
.004"
(permissable) and a
.006"
(no
go) feeler
gauge.
6. It is not necessary to grind Buick linings
after installation on shoes as linings are cor-
rectly ground in production. It is ad
visable,
however, to place shoes in drum and check for
proper arc and fit in
drum,
using feeler
gauges.
No more than .004" clearance should exist be-
tween lining and drum at any point.
STR UT
PRIMARY SHOE
ANCHOR PIN & SHO E GU'TbE
•
NUT
ADJUSTING SCREW
LOCK
SPRING
BRAKE
LEVER
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