Chevrolet 10 Series 1968, Service Manual

Page: 259 / 713

BRAKES 5-26
F ig . 48—Removing Pul! Back Springs Using Too! J-2 2 3 4 8
NOTE:
If brake drums are worn severely, it
may be necessary to retract the adjusting
screws as previously outlined.
3. Using Tool J-22348 remove the brake shoe pull back
springs (fig. 48).
NOTE:
Since wheel cylinder piston stops are
incorporated in the anchor brackets, it is not
necessary to install wheel cylinder clamps when
the brake shoes are removed. However, the
brake pedal must not be depressed while the
drums are removed.
F ig . 4 9 —Removing Brake Shoe Hold Down Pins
Using Tool J-2 2 3 4 8
4. Loosen the actuating lever cam cap screw and while
holding the star wheel end of the actuating lever past
the star wheel, remove the cap screw and cam.
5. Remove the brake shoe hold down springs and pins
by compressing the spring with Tool J-22348 and, at
the same time, pushing the pin back through the
flange plate toward the tool. Then, keeping the spring
compressed, remove the lock from the pin with a
magnet (fig. 49).
6. Lift off the brake shoe and self adjuster as an
assembly.
7. The self adjuster can now be removed from the brake
shoe by removing the hold down spring and pin.
NOTE:
The actuating lever, override lever and
spring are an assembly. It is hot recommended
that they be disassembled for service purposes
unless they are broken. It is much easier to as­
semble and disassemble the brakes leaving them
intact.
8. Thread the adjusting screw out of the anchor support
and remove and discard the friction spring.
9. Clean all dirt out of brake drum. Inspect drums for
roughness, scoring or out of round. Replace or re ­
condition drums as necessary.
NOTE:
If, when reconditioning drums, an un­
dercut of more than .045" is needed, replace the
drum.
10. Carefully pull lower edges of wheel cylinder boots
away from cylinders. If brake fluid flows out, over­
haul of the wheel cylinders is necessary.
NOTE:
A slight amount of fluid is nearly al­
ways 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 lb. ft. 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 Bendix or Delco brake lube or
Lubriplate 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.
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. 50).
6. Install cup, spring and retainer on end of hold down
pin. Using Tool J-22348 compress the spring. With
spring compressed, push the hold down pin back
CHEVROLET TRUCK SERVICE MANUAL