Chevrolet 10 Series 1970 Service Manual page 245

! FRONT SHOE
ADJUSTING STUD
REAR SHOE
ADJUSTING STUD
F ig . 11—A d ju s tin g Type " F "
12). M ove tool handle tow ard axle to rotate adjusting
w heel and d ecrea se
drags on drum. (Do not fo r c e adjusting cam .) F irm ly
depress foot pedal to center shoes and again d ecrea se
clearan ce until drag is fe lt on drum.
3. R e lie v e drag by rotating adjusting wheel in opposite
d irection . Back o ff adjustment as follow s:
F ig . 12—A d ju s tin g Type " F R -3 " Rear Brakes
Front Brakes
lining clearance until lining
F o r worn lining—3 notches (click s)
F o r new lining—5 notches (clic k s )
4. A t other adjusting slot, repeat steps 2 and 3 to adjust
other shoe.
5. Install adjusting hole co v e rs in backing plate.
Bleeding Brakes
The hydraulic brake system must be bled whenever any
line has been disconnected o r a ir has in som e way entered
the system . A "sp o n g y "
applied may indicate presen ce of a ir in the system . The
system must be absolutely
B leed er va lves are provided on pow er cylin der
m odels), main cylin der (som e m odels) and at w heel c y l­
inders. Type " F" front brakes have two cylin d ers p er
wheel and each has a b leed er va lve. Type " F R - 3 " re a r
brakes have two cylin ders p e r wheel with a b leed er va lve
at the top cylin der only.
sequence.
NOTE:
If main cylin der or pow er cylin d er is
not equipped with a b leed er valve and bleeding at
the wheels does not produce sa tisfa ctory resu lts,
it w ill be n ecessa ry to disconnect line fro m main
cylin der and b leed it through output port. Then
reconnect line and disconnect pow er cylin d er
output line and bleed the pow er cylinder.
connect line and check operation of brakes.
s till not sa tisfa ctory , rebleed w heel cylin ders.
Brake Fluid
Use D elco H ydraulic Brake Fluid No. 11 o r equivalent
when se rv ic in g brakes. This brake flu id is sa tisfa cto ry
fo r any clim ate and has a ll the qu alities n ecessa ry fo r
p ro p er operation, such as a high boilin g point and the
ability to rem ain flu id at low tem peratures.
In the event that im p rop er fluid has entered the system ,
it w ill be n ecessa ry to s e rv ic e the system as follow s:
1. Drain the en tire system .
2. Thoroughly flush the system with clean alcohol, 188
proof, or a hydraulic system cleaning fluid such as
"D e c le n e " or equivalent.
BRAKES 5-7
pedal fe e l when the brakes are
fr e e of a ir at a ll tim es.
(som e
See F igu re 13 fo r bleeding
R e­
If
CHEVROLET TRUCK SERVICE MANUAL