5D-4 1968
PONTIAC
SERVICE
MANUAL
RETAINING
PIN
OUTBOARD
CALIPER
HALF
BLEEDER
VALVE
INBOARD
CALIPER
HALF
CALIPER
BOLTS
Fig* 5D-6
Exploded
View
of
Caliper
halves. Lubricate hex head
bolts
with brake
lubri-
cant, or dip in clean brake fluid. Fit caliper halves
together,
install
bolts
and torque to 130 lb. ft.
NOTE:
It is very important that
caliper
bolts be
lubricated
and torqued to values specified. Use a
reliable
torque wrench.
10. Install
shoe
assemblies in caliper and push
pistons into bore.
11. Install retaining pin and cotter pin.
NOTE:
Head
of retaining pin must be on outboard
side
of caliper.
CALIPER—INSTALL
1. Position caliper over disc and attach to mount-
ing bracket with two hex head bolts. Torque mounting
bolts
to 75 lb. ft.
2. Connect brake line
tube
nut to caliper.
3.
Calipers are now ready to be bled with Delco
Supreme No. 11 brake fluid or equivalent.
BRAKE
DISC
In
manufacturing brake disc, tolerance of rubbing
surfaces for flatness is .001" and for parallelism is
.0005", while lateral runout of the faces must not
exceed
.004" total. Maintenance of
these
close
con-
trols of the shape of the rubbing surfaces is neces-
sary
to prevent brake roughness. In addition, surface
finish
must be non-directional and maintained at
30-50
micro-inch.
This
control of rubbing surface
finish
is necessary to avoid pulls and erratic per-
formance and promote long lining life and equal
lining
wear of both
left
and right brakes. (Fig. 5D-7)
Light
scoring of disc surfaces not exceeding .015"
in
depth, which may result from normal use, is not
detrimental to brake operation.
When
total disc thickness is
less
than .965" (Tem-
pest) or
1.215"
(Pontiac), disc snould be replaced.
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