Chevrolet 10 Series 1968, Руководство по обслуживанию

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BRAKES 5-28
ACTUATING LEVER-------- ►
90°
TOP VIEW
ACTUATING LEVER
END VIEW
F ig . 53 —Plug G au g e Position for Correct Actuator
Lever Adjustm ent—Front and Rear Brakes
When brake lining replacement is necessary, replace
the shoes and linings on both front wheels or both rear
wheels. On low mileage vehicles where a grease seal
leak or minor chatter has developed, replacement of both
shoes on that wheel is permissible. In no case should a
single shoe or lining be replaced.
60 Series—Front (Wagner Type “ F” )
Rem oval (Figs. 54 and 55)
1. Jack up a x l e and remove hub and brake d r u m
assembly.
2. Remove both brake shoe return springs, using Tool
J-22348.
3. Remove C-washer and flat washer from adjusting
cam and hold-down stud. Lift shoes off backing
plate.
4. Clean all dirt out of brake drum. Inspect drum for
roughness, scoring, or out-of-round. Replace or
recondition brake drum as necessary.
5. Inspect wheel bearings and oil seals as outlined in
Section 3.
6. Check flange plate attaching bolts to make sure they
are tight (160-210 ft. lbs.) and to clean all dirt off
flange plate.
7. Inspect brake s h o e return springs. If broken,
cracked, or weakened, replace with new springs.
8. Check cam and shoe guide stud and friction spring on
flange plate for corrosion or binding. Cam stud
should turn easily with an eight inch wrench, but
should not be loose. If frozen, lubricate with kero­
sene or penetrating oil and work free.
9. Examine brake shoe linings for wear. Linings should
be replaced if worn down close to rivet heads. Refer
to “ Brake Shoe Relining” in this section.
Installation (Figs.
54
and
55)
1. Install anti-rattle spring washer on each cam and
shoe guide stud, pronged side facing adjusting cam.
2. Place shoe assembly on backing plate with cam and
shoe guide stud inserted through hole in shoe web;
locate shoe toe in wheel cylinder piston shoe guide
and position shoe heel in slot in anchor block.
3. Install flat washer and C-washer on cam and shoe
guide stud. Crimp ends of C-washer together.
4. After installing both shoes, install brake shoe return
springs. To install each spring, place spring end
with short hook in toe of shoe, then using Tool
J-22348, stretch spring and secure long hook end in
heel of opposite shoe.
5. Install hub and brake drum assembly.
6. Adjust brake as directed under “ Brake Adjustments”
in “ Maintenance and Adjustments.”
60 Series—Rear
(Wagner Type “ FR-3” )
Removal (Figs.
56
and
57)
1. Jack up axle and remove brake drum assembly as
directed in Section 4.
2. Install wheel cylinder clamps to hold pistons in
cylinders.
3. Using Tool J-8049, remove brake s h o e return
springs.
4. Remove lock wires, nuts, and washers from brake
s h o e guide bolts, then r e m o v e brake shoe
assemblies.
5. Remove s c r e w s attaching adjusting wheel lock
springs to anchor supports. Thread each adjusting
screw from the shoe side of the anchor support by
turning adjusting wheels, then lift adjusting wheels
out of slots in anchor supports.
6. Clean all dirt out of brake drum. Inspect drum for
roughness, scoring, or out-of-round.
7. Recondition or replace drum as necessary. Inspect
brake flange plate for oil leakage past axle shaft oil
seal. Install new seals if necessary.
8. Clean all dirt out of anchor pin holes and adjusting
screw openings in anchor supports.
9. Inspect wheel bearings and oil seals as directed in
Section 3.
10. Inspect b r a k e shoe r e t u r n springs. If broken,
cracked, or weakened, replace with new springs.
11. Inspect threads on adjusting screws for wear or
damage. Replace as necessary.
12. Examine brake shoe linings for wear. Linings should
be replaced if worn down close to rivet heads. Refer
to Brake Shoe Relining in this section.
Installation (Figs.
56
and
57)
1. Install adjusting screws and wheels in anchor sup­
ports dry; use no lubricant. Insert each adjusting
CHEVROLET TRUCK SERVICE MANUAL