Chevrolet 10 Series 1970 Service Manual page 277

F ig . 6 8 — In fe rn a l E xpanding Type Brake
1. P late Lo ca tin g Pin
2. P rim ary Shoe and
L in in g
3. Brake Lever
4. Return S pring
5. Lever S trut
6. Pin
7. C lip
8. B acking Plate
9. G u id e P late
10. R einfo rcem ent
11. A n c h o r Pin
12. Lock W asher
13. A n c h o r Pin N u t
3. R em ove nuts fro m lo w e r brake band bracket adjust­
ing bolt, then rem o ve bolt.
4. R em ove " J " bolt by pushing up on bolt until it c le a rs
c le v is pin in brake cam.
5. Cut lock w ire , back o ff anchor adjusting s crew until
c le a r o f anchor.
6. Slide band assem b ly
s c re w spring as band is rem oved.
Inspection
1. Exam ine braking su rface o f drum fo r roughness o r
scorin g. If drum is w orn o r damaged, it must be
replaced as d irected la te r.
2. Inspect brake lining.
heads, new lining must be installed.
3. Exam ine tension and re le a s e
weak o r broken.
Relining
1. R em ove r iv e ts and lining fro m brake band and tho­
roughly clean band.
2. R ivets should be in stalled fro m cen ter, a ltern ately
working toward each end o f band.
3o Check lining to band a ir gap. A .010" fe e le r must not
en ter at any point.
14. S econdary Shoe
and Lin in g
15. S trut Spring
16. B acking P late Bolts
17. C a b le B racket
18. C a b le Assem bly
19. S ocket
20 . A d ju s tin g Screw
2 1 . N u t
2 2 . C o n n e c tin g S pring
23 . W asher
2 4 . Spring
2 5 . Cup
2 6 . H o ld -D o w n Pin
o ff drum, rem ovin g anchor
If w orn down close to r iv e t
sp rin gs; replace if
Installation
1. P la ce band and lin in g assem bly o v e r brake drum.
P la ce anchor s c re w spring in d epression in anchor
and com press sprin g
placed o v e r anchor.
2. In stall anchor s c re w through bracket and spring into
anchor. In sert lo w e r brake band bracket adjusting
bolt through band lo w e r bracket and hole in support
and start nuts on bolt.
3. In stall new c le v is pin through operating cams and
link plate. P osition operating cam s on top o f band
upper bracket with toe o f cam facin g forw ard.
4. In sert threaded end o f adjusting bolt down between
operating cam s. Position hook toward re a r. As bolt
is low ered into place it must pass through band upper
bracket, upper r e le a s e spring, brake support lo w er
r e le a s e spring, and band
fla t w asher, adjusting nut, lock w asher, and lock nut
on adjusting bolt.
NOTE: On O rsch eln
tension spring is used.
5. Adjust parking brake as previo u sly co v ered under
Maintenance and Adjustment.
Brake Drum
Removal
1. Rem ove brake band and lining assem bly as p r e ­
viou sly directed.
2. R em ove nuts and lock w ashers fro m bolts attaching
p ro p e lle r shaft U -jo in t flange and brake drum to
tran sm ission output shaft flange.
le r shaft at slip join t and lo w er end o f p ro p e lle r
shaft to flo o r . Rem ove
w ashers, and bolts attaching p r o p e lle r shaft center
bearing hanger b racket to cro ssm em b er.
Brake Shoe
Removal (Fig. 6 8 )
1. Rem ove two return springs and anchor pin link fro m
cam ends o f brake shoes. Spread ends o f brake shoes
fa r enough to p e rm it rem oval fro m support plate.
Rem ove shoes, then separate by rem ovin g adjusting
screw and adjusting sc re w spring.
2. Replace lining i f worn down close to r iv e t beads.
R ive t new lining s ec u rely
3. Inspect two shoe return
screw .
The drum and output shaft flange w ill be rem oved by
rem ovin g the nut on the end o f the output shaft, then
pulling the assem bly fro m the spliner output shaft.
CAUTION: Do not ham m er o r p ry drum during
rem oval.
4. Rem ove bolts and nuts fro m flange and drum a ssem ­
bly to separate drum and flange.
Installation
1. Wipe clean mating su rfaces of brake drum and out­
put shaft flan ge. Line up brake drum and flange,
in sta ll bolts and nuts.
2. Slide drum and flange assem bly o v e r splin es onto
output shaft.
3. On jobs with parking brake drum assem bly attached
to output shaft by a cen ter bolt, place lock washer
and special s e rra te d fla t w asher on bolt.
BRAKES 5-39
as band anchor bracket is
lo w er brack et. In stall
type parking brake, no
T elesco p e p ro p e l­
i f n ecessa ry, nuts, lock
and even ly on shoes.
springs, and adjusting
Install
CHEVROLET TRUCK SERVICE MANUAL