Installing Pull Back Spring; Checking Actuating Lever - Chevrolet 10 1971 Series Chassis Service Manual

Fig. 30— Installing Pull Back Spring
6. Disengage the link end from the anchor pin and then
from the secondary shoe.
7. Remove hold-down pins and springs using any suit­
able tool.
8. Remove the actuator assembly.
The actuator, pivot and override spring
NOTE:
are an assembly. It is not recommended that
they be disassembled for service purposes,
unless they are broken. It is much easier to
assemble and disassemble the brakes by leaving
them intact.
9. Separate the brake shoes by removing adjusting screw
and spring.
10. Remove parking brake lever from secondary brake
shoe.
11. Clean dirt out of brake drum. Inspect drums for
roughness, scoring or out of round. Replace or
recondition drums as necessary.
12. Carefully pull lower edges of wheel cylinder boots
away from cylinders and note whether interior is
wet with brake fluid. Excessive fluid at this point
indicates leakage past piston cups requiring overhaul
of wheel cylinder.
: A slight amount of fluid is nearly always
NOTE
present and acts as lubricant for the piston.
13. Inspect backing plate for oil leakage past axle shaft
oil seals. Install new seals if necessary.
14. Check all brake flange plate attaching bolts to make
sure they are tight. Clean all rust and dirt from
shoe contact faces on flange plate, using fine emery
cloth.
Installation (Figs. 29 thru 34)
Make certain to install recommended
CAUTION:
shoe and lining assemblies. Otherwise, serious
fade or permanent failure may occur.
1. Inspect new linings and make certain there are no
nicks or burrs or bonding material on shoe edge
where contact is made with brake flange plate or on
any of the contact surfaces.
Fig. 31— Checking Actuating Lever
Keep hands clean while handling brake
NOTE:
shoes. Do not permit oil or grease to come in
contact with linings.
2. Lubricate parking brake cable.
Lubricate fulcrum end of parking brake lever and
3.
the bolt with brake lube, then attach lever to sec­
ondary shoe with bolt, spring washer, lock washer
and nut. Make sure that lever moves freely.
4. Before installation, make certian the adjusting screw
is clean and lubricated properly.
Loose adjustment may occur from an
NOTE:
adjusting screw that is not properly operating.
Fig. 3 2 — Using D rum -to-Brake G auge J —21177
BRAKES 5-13
" " - v ___ ——
10-30 CHEVROLET TRUCK SERVICE MANUAL