Chevrolet 10 Series 1970 Service Manual page 318

BRAKES 5-80
F i g . 1 3 2 — C a g i n g
NOTE:
If both cham bers are to be rem oved,
p e rfo rm step 2 on each BEFO RE proceeding
further.
3. Open a ir tank drain v a lv e s and exhaust p ressu re
fro m brake system .
4. Disconnect a ir lin es at cham ber.
NOTE:
If only the em ergen cy parking cham ber
needs to be rem oved, this may be done at this
point by rem oving r e a r clam p ring and liftin g
re a r cham ber assem bly
chamber. (F ig. 133).
5. Disconnect push rod c le v is fro m slack adjuster.
6. R em ove nuts and lock w ashers from mounting studs.
7. R em ove brake chamber fro m mounting bracket.
Installation
1. P la ce cham ber in position on mounting bracket.
2. Install lock w ashers and nuts on studs.
3. Connect push rod c le v is to slack adjuster.
4. Connect a ir lin es at cham ber.
5. Start engine and build up a ir p ressu re to operating
le v e l. Make sure knob is pushed in on em ergency
parking brake v a lv e on instrument panel.
6. Back o ff nut fro m " c a g in g " stud in end o f cham ber.
R em ove stud and rep la ce in storage pocket on cham­
b er housing. Install rubber cap o v e r r e le a s e stud
hole.
7. Check operation o f brakes.
8. Check fo r leaks.
Disassem bly (Fig. 135)
NOTE:
S cribe a m a r k
reassem bly.
1. With parking brake spring
clam p ring.
2. R em ove parking brake spring, spring housing and
spring plate as an assem bly.
NOTE:
If the spring, spring housing o r spring
plate should need replacin g it is recom m ended
T o o l
o ff front (s e r v ic e )
on all p i e c e s for
" c a g e d " rem o ve re a r
SERVICE BRAKE
SPRING H O U SIN G
PARKING BRAKE
DIAPHRAGM
F i g . E m e r g e n c y a n d
133—
that a new unit be replaced as an assem bly
(fig . 134).
3. Rem ove parking brake diaphragm .
4. Rem ove front clamp
assem bly.
5. Rem ove the screw s fro m front and re a r of adapter.
6. Rem ove adapter plates,
diaphragm return spring fro m adapter.
7. R em ove " O " ring fro m bore o f adapter.
8. Rem ove s e r v ic e brake diaphragm.
9. Rem ove push rod assem bly.
10. Rem ove s e rv ic e diaphragm return spring.
Assembly (Fig. 135)
NOTE: Take note o f scrib e line.
1. P la ce s e rv ic e diaphragm
housing and install push rod assem b ly.>
2. Install new " O " ring in adapter b ore.
lube on " O " ring to assem ble.
3. A ssem ble adapter plates, adapter rod, and parking
F ig . 134—C agin g Tool In s ta lle d
PARKING BRAKE
SPRING H O U SIN G
P a r k in g C h a m b e r
ring and r e m o v e adapter
adapter rod and parking
return spring in front
Use a lig h t
CHEVROLET TRUCK SERVICE MANUAL