Caliper - Install 5D-4; Brake Disc - Pontiac tempest 1968 Service Manual

5D-4 1968 P O N T I A C SERVICE MANUAL
R E T A I N I N G P I N
O U T B O A R D
C A L I P E R H A L F
B L E E D E R V A L V E
I N B O A R D
C A L I P E R H A L F
C A L I P E R B O L T S
F i g * 5D-6 Exploded V i e w of C a l i p e r
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.