Chevrolet Light Duty Truck 1973 Service Manual page 313

Fig. 81-Removing Hold Down Pins Using J-22348
away from cylinders. If brake fluid flows out,
overhaul of the wheel cylinders is necessary.
NOTE: A slight amount of fluid is nearly
always present and acts as a lubricant for the
piston.
11. Inspect flange plate for oil leakage past axle shaft
oil seals. Install seals if necessary.
12. Check all flange plate attaching bolts to make sure
they are tight (150 ft. lbs. torque). Clean all dirt
and rust from shoe contact faces on flange plate
using emery cloth.
13. Thoroughly clean adjusting screws and threads in
the anchor brackets.
Installation
1. Put a light film of Delco Brake Lube #5450032 (or
equivalent) on shoe bearing surfaces of brake
flange plate and on threads of adjusting screw.
2. Thread adjusting screw completely into anchor
bracket without friction spring to be sure threads
are clean and screw turns easily. Then remove
screw, position a new friction spring on screw and
reinstall in anchor bracket.
See "Caution" on Page 1 of t h i s
CAUTION:
s e c t i o n .
3. Assemble self adjuster assembly to brake shoe and
position actuating lever link on override lever.
4. Position hold down pins in flange plate.
5. Install brake shoe and self adjuster assemblies onto
hold down pins, indexing ends of shoes with wheel
cylinder push rods and legs of friction springs.
NOTE: Make sure the toe of the shoe is
against the adjusting screw (fig. 82).
. Install cup, spring and retainer on end of hold
6
down pin. Using Tool J-22348, compress the spring.
With spring compressed, push the hold down pin
Fig. 82-Brake Shoe and Self Adjuster Assembly
Fig. 83 Measuring Points for Shoe Centering
back through the flange plate toward the tool and
install the lock on the pin.
7. Using Tool J-22348, install brake shoe return
springs.
. Holding the star wheel end of the actuating lever as
8
far as possible past the star wheel, position the
adjusting lever cam into the actuating lever link
and assemble with cap screw.
9. Check the brake shoes for being centered by
measuring the distance from the lining surface to
BRAKES 5 -4 7
LIGHT DUTY TRUCK SERVICE MANUAL