Chevrolet Light Duty Truck 1973 Service Manual page 300

5 -3 4 BRAKES
Installation
NOTE: Installation of the caliper and
mounting parts (rubber bushings, sleeves,
bolts, and shoe and lining assemblies) is the
same as for: Brake Shoes and Linings -
except for the steps given below.
1. Connect the brake hose to the caliper using new
copper gaskets. Torque connector bolt to
specifications.
Hose must be positioned i n the
CAUTIO N:
caliper locating gate (between locating beads)
t o assure proper positioning t o c a l i p e r .
See "Caution" on page I of t h i s s e c t i o n .
Bleed the calipers using the method outlined earlier
2 .
in this section.
DISC SERVICING
Servicing of the brake disc is extremely critical since
accurate control of the disc tolerances is necessary to
ensure proper brake operation.
Brake discs can be refinished if precision equipment is
available and a few simple rules are followed. The first
thing to do is to determine which of the following will
need to be done. RESURFACE, RECONDITION or
REPLACE.
with a flat sanding disc (with disc
R ESU R FA CE
rotating) if scoring is light or if the disc surface has
severe rust scale.
if scoring is deep or if runout, thickness
RECO N D ITIO N
B O O T IN S T A L L E R
J - 2 2 9 0 4
Fig. 63 Installing Boot to Caliper
variation, flatness and parallelism are out of specifica­
tion. Scoring of the brake disc surfaces not exceeding
.015 inch in depth, which may result from normal use,
is not detrimental to brake operation.
CAUTION:
treated i n the same manner. If one side needs
resurfacing or reconditioning the opposite side
should be treated i n the same manner.
REPLA C E
within specifications and meet the minimum thickness
specification after reconditioning.
CAUTION:
thickness dimension cast into them. This
dimension i s the minimum wear dimension and
not a r e f i n i s h dimension. Do not r e f i n i s h a
brake disc that w i l l not meet the specificatio ns
as shown below after refinishing:
MINIMUM THICKNESS
AFTER REFINISHING
Minimum Requirements
The disc brake surfaces must meet the following
specifications:
1. BOTH
BEARING C U P C E N T E R LIN E W ITH IN .003 T.I.R.
To check, mount the hub and disc to the lathe on
the bearing cups—
(fig. 64).
2.
FIN ISH IS TO BE 20-60 M ICR O -IN CH ES AND
D U ST
B O O T
Both sides of the disc must be
if the disc cannot be reconditioned to bring it
All brake disc have a minimum
REPLACEMENT
1.230
.980
SU R FA C ES M UST BE
mount on hub surface
Do not
Fig. 6 4 -Hub and Disc Mounting
LIGHT DUTY TRUCK SERVICE MANUAL
(DISCARD)
THICKNESS
1.215
.965
SQUARE WITH