Chevrolet 10 Series 1970 Service Manual page 267

1. M a n ifo ld Tube(s)
2 . B o lt, C y lin d e r A n c h o r
3. W asher, A n c h o r B olt
4 . S crew , Lock W asher,
W h e e l C y lin d e r
5. P late, Brake B acking
11. SHOE R E L IN E - A 3/4 inch hole is requ ired fo r the
contact plug. If lining is not p r e -d r ille d , locate the
hole by making a paper tem plate o f the shoe table.
Cut hole with a hole saw and de-b u rr the edges. If
lining is to be su rface ground, an assem bled contact
plug m ay be ground even with lining by blocking
automatic adjuster in fu lly extended position. Grind
lining 0.020 to 0.030 inch le s s than standard drum
d iam eter to p rovid e "b r e a k in " clearan ce at lining
ends.
NOTE: The W agner Type
must be manually adjusted with drum on at a ll
in itia l installations as this type brake does not
autom atically adjust in itia l clearan ce.
Installation (Fig. 5 5 )
1. In stall autom atic adjuster, contact plug flush with
lining su rface: Replace wedge guide on shoe web on
side away fro m mounting plate, serra tion s facing
away fro m shoe table. L ay wedge on web with s e r r a ­
tions against matching serra tio n s on the wedge guide,
F ig . 5 5 — Type " F A "
6. Sc rew , W h e e l C y lin d e r
Bleede r
7. Brake Shoe
8. Brake L in in g
9. R ivet, Brake L in in g
10. Lever, A u to m a tic A d ju s te r
" F A " front brakes
S e lf-A d ju s tin g Brake Components
G u id e , A d ju s te r W edge
11.
12. W edg e, A u to m a tic A d ju s te r
13. P lug, Drum C o n ta c t
14. W asher, W edge R eta in er
15. S pring , A d ju s te r Torsion
S pring, A d ju s te r W edge
16.
slot aligned on le v e r p ivot pin hole. In sert contact
plug, fro m the underside of shoe, guiding its shank
through the hole in the shoe table and o v e r wedge
guide and w edge. In sert adjuster le v e r pins through
shoe web fro m opposite side, guiding the actuating
(cen ter) pin into the mating hole o f the contact plug
shank. P la ce wedge w asher o v e r shoulder o f p ivot
pin. Slide " U " hook o f adjuster spring on pin o v e r
contact plug shank.
spring to this hook, then install c o il o f adjuster
torsion spring o v e r the pivot pin and pull the spring
hook o v e r the edge o f web. Connect wedge actuating
spring on ra ised hook on the wedge " f o r k . "
r e tra c t the wedge against the le v e r p ivot pin, p r e s s ­
ing upon the contact plug to p e rm it this m ovem ent.
If plug now protru des m ore than 0.005-inch above
lining, clam p shoe in vis e
against the adjuster le v e r and d ress down the plug.
This can be done with a file , taking ca re not to crea te
a " fla t spot" on the lining. (A ltern a tely, plug may be
ground with lining by blocking adjuster le v e r in e x ­
tended position .) If fu lly extended plug is m ore than
0.005-inch below lining su rface,
plug.
BRAKES 5-29
17. W asher, Shoe G u id e
18. W ave W asher, Shoe G u id e
19. " C " W asher, Shoe G u id e
S pring, Shoe R e tra ctin g
20.
21. W hee l C y lin d e r
Attach end o f wedge actuating
Fu lly
so that v is e jaw s bea r
rep la ce with new
CHEVROLET TRUCK SERVICE MANUAL