Chevrolet 10 Series 1968, Service Manual

Page: 256 / 713

BRAKES 5-23
F ig . 40—C h eckin g A ctu atin g Lever Operation
10. Remove parking brake lever from secondary brake
shoe (rear only).
11. Clean dirt out of brake drum using care to avoid
getting dirt into front wheel bearings. Inspect drums
for roughness, scoring or out of round. Replace or
recondition drums as necessary.
12. Inspect wheel bearings and oil seal and replace any
necessary parts.
13. 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 indi­
cates leakage past piston cups requiring overhaul of
wheel cylinder.
NOTE: A slight amount of fluid is nearly al­
ways present and acts as lubricant for the
piston.
14. If working at rear wheels, inspect backing plate for
oil leakage past axle shaft oil seals. Install new seals
if necessary.
15. 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
CA U TIO N : Make certain to install recom­
mended 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.
NOTE:
Keep hands clean while handling brake
shoes. Do not permit oil or grease to come in
contact with linings.
2. If working on rear brakes, lubricate parking brake
cable.
3. On rear brakes only, lubricate fulcrum end of park­
ing brake lever and the bolt with brake lube, then
F ig .
41
—inspecting for Proper Lubrication
attach lever to secondary shoe with bolt, spring
washer, lock washer and nut. Make sure that lever
moves freely (fig. 40).
4. Before installation, make certain the adjusting screw
is clean and lubricated properly (fig. 41).
NOTE:
Loose adjustment may occur from an
adjusting screw that is not properly operating.
If the lubrication in the adjusting screw of as­
sembly is contaminated or destroyed, the ad­
justing screw should be thoroughly cleaned and
lubricated.
5.
Connect brake shoes together with adjusting screw
spring, then place adjusting screw, socket and nut
in position.
CA U TIO N :
Make sure the proper adjusting
screw is used (left hand or right hand). The star
wheel should only be installed with the star
wheel nearest to the secondary shoe and the
adjusting screw spring inserted to prevent inter-
ference with the star wheel.
6. Install parking brake cable (rear only).
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.
8. Install and secure the actuator assembly and second­
ary brake shoe with the hold down pin and spring
using a pair of needle nose pliers (on rear position
parking brake strut and strut spring).
9. Install guide plate over anchor pin.
10. Install the wire link.
NOTE:
Do not hook the wire link over the
anchor pin stud with the regular spring hook
tool. This may damage the cylinder boot seals.
Fasten the wire link to the actuator assembly
first, and then place over the anchor pin stud by
CHEVROLET TRUCK SERVICE MANUAL