Chevrolet 10 Series 1970 Service Manual page 289

F ig . 9 0 — W edge and R o lle r Assem bly
1. R e ta in in g Cage
2. Ears on W asher
3. R o lle r
3. In stall clam ping ring on assem bly and secu re with
bolt and nut.
4„ In stall a ir cham ber in brake spider housing until it
" b o tto m s" in sp id er.
one fu ll turn to position cham ber ports in line with
a ir tubes. The p lastic guide w ill assure p ro p er
P L U N G E R
F ig . 9 1 — In s ta llin g Seal on A n c h o r P lunger
4. W edge Return S pring
5. Return S pring W asher
6. W edge
Then back off not m ore than
SEAL
positioning o f the wedge. At this point lock the a ir
cham ber in position by tightening the spanner nut
into spider housing. (See Figu re 88).
BRAKE SHOES A N D LININGS
Brake Shoe
Removal (Fig. 89 )
1. Jack up re a r of veh icle and rem ove wheels.
2. Rem ove hub and brake drum assem bly.
" R EAR SU SPE N SIO N " under " HUBS AND B E A R ­
IN G S " (SEC. 4) of this manual.
3. R em ove brake shoe return springs fro m both shoes.
4. L ift brake shoe web out of shoe hold-down clip and
out of notches in anchor and adjusting plungers.
NOTE: M ark adjusting end of brake shoes to
insure c o r r e c t rea ssem b ly.
shoes re la tiv e to shoe rotation.
Shoe Relining
Each brake shoe consists of a shoe table with a single
web w elded in place.
riv e te d to each shoe. Lining should be rep la ced b efore
w ea r exposes the r iv e t heads and causes damage to
brake drums. Both linings on each shoe a re identical
and can be in stalled at eith er end. New linings must be
se cu re ly riv e te d to shoe with c o rre c t s iz e riv e ts , and
r iv e ts must be p ro p e rly upset.
fic ie n c y can be obtained
trued-up with a lining g rin d er so they a re p ro p e rly
c en tra lized in relation to center of hub.
Installation (Fig. 89 )
1. P osition brake shoe webs inside hold-down clip s with
ends engaging slotted end of anchor plungers and
slotted end of adjusting bolt.
NOTE: B rake shoes
4 -inch radius on the adjusting end and a 3 -inch
radius on the anchor end. When in stallin g shoes
on brake assem bly, make certain the end m arked
as suggested in " N O T E " of step 4 of " R e m o v a l"
is mounted in adjusting plunger.
2. Install brake shoe
hold-down clip applies p ressu re to shoe web to avoid
cocked shoes.
BRAKE ACTUATION COM PONENTS
Actuation components can be s e rv ic e d without rem ovin g
spid er fro m axle. Trou ble diagnosis might indicate faulty
internal part o r p arts which would not necessitate brake
cham ber disassem bly o r new brake lining.
components should then be inspected fo r faulty o r unac­
ceptable condition.
F o r s e r v ic e of automatic adjuster components see
procedu res under that subject on a previou s page o f this
section. The follo w in g p rocedu res co ver the anchor end
components and other actuation components.
Removal (Fig. 89 )
1. R em ove brake cham bers. R e fe r to p roced u res c o v e r­
ing standard and/or " F a il-S a fe " cham ber s e rv ic e .
BRAKES 5-51
R e fe r to
Check m arkings on
A tw o-p iece m olded lining is
Maximum braking e f­
im m ediately if linings a re
a re constructed with a
return spring. Make certain
Actuation
CHEVROLET TRUCK SERVICE MANUAL