Chevrolet Light Duty Truck 1973 Service Manual page 292

5 -2 6 BRAKES
4. Before installation, make certain the adjusting
screw is clean and lubricated properly.
CAUTION:
Loose adjustment may occur from
an adjusting screw that i s not properly
operating. If the lubrication i n the adjusting
screw assembly i s contaminated or destroyed,
the adjusting screw should be thoroughly
cleaned and lubricated with Delco Brake Lube
#5450032 (or equivalent).
5. Connect brake shoes together with adjusting screw
spring, then place adjusting screw, socket and nut in
position.
CAUTION:
Make sure the proper adjusting
screw i s used ( l e f t hand or ri gh t hand). The
star wheel should only be installed with the star
wheel nearest t o the secondary shoe and the
adjusting screw spring inserted t o prevent
interference with the star wheel. Make sure
right hand thread adjusting screw i s on l e f t side
of car and l e f t hand thread adjusting screw i s
on right side of c a r . Make certain star wheel
l i n e s up with adjusting hole i n flange p l at e .
If original shoe and lining assemblies are being
r e i n s t a l l e d , they must be installed i n original
positions (as marked at removal).
. Install parking brake cable.
6
7. Secure the primary brake shoe (short lining faces
forward) first with the hold down pin and spring
using a pair of needle nose pliers. Engage shoes
with the wheel cylinder connecting links.
. Install and secure the actuator assembly and
8
secondary brake shoe with the hold down pin and
spring using a pair of needle nose pliers. Position
parking brake strut and strut spring.
9. Install guide plate over anchor pin.
10. Install the wire link.
CAUTION:
Do not hook the wire link over the
Fig. 5 0 -Installing Pull Back Spring
anchor pin stud with the regular spring hook
t o o l . Fasten the wire lin k t o the actuator
assembly f i r s t , and then place over the anchor
pin stud by hand while holding the adjuster
assembly i n full down position.
11. Install actuator return spring.
CAUTION:
Do not pry actuator lever t o i n s t a l l
return spring. Ease i t i n place using the end of
a screwdriver or other suitable flat t o o l .
12. If old brake pull back (return) springs are nicked,
distorted, or if strength is doubtful, install new
springs.
13. Hook springs in shoes using Tool J-8049 by
installing the primary spring from the shoe over the
anchor pin and then the spring from the secondary
shoe over the wire link end (fig. 50).
14. Pry shoes away from the flange plate and lubricate
shoe contact surfaces with a thin coating of Delco
Brake Lube #5450032 (or equivalent).
CAUTION:
Be careful t o keep lubricant off
facings.
15. After completing installation, make certain the
actuator lever functions easily by hand operating
the self-adjusting feature (fig. 51).
16. Follow the above procedure for all brakes.
17. Adjust the service brakes and parking brake as
outlined under "Maintenance and Adjustments" in
this section.
18. Install drum, wheel and tire and lower the vehicle to
floor. Test brake operation.
Relining Brake Shoes
If old brake shoes are to be relined, inspect shoes for
distortion and for looseness between the rim and web;
these are causes for discarding any shoe. If shoes are
serviceable, be governed by the following points in
installing new linings:
1. Remove old linings by drilling out rivets. Punching
rivets out will distort shoe rim. Thoroughly clean
FWD
Fig. 5 1 -Checking Actuating Lever
LIGHT DUTY TRUCK SERVICE MANUAL