Buick LeSabre 1965 Service Manual page 567

BRAKES POWER BRAKES 9 - 4 5
REACTION
AIR VALVE
RETURN
SPRING
FILTER
Figure 9-43—Removal of Air Filter, Diaphragm, Lock Key, Valve and Rod Assembly and Reaction Disc
9 - 2 7 ASSEMBLY OF
POWER BRAKE
1. Before assembly of master
cylinder, thoroughly c l e a n all
parts in clean alcohol and place
parts in a clean pan or on a clean
paper. Coat bore of master cyl-
inder with brake fluid. If sec-
ondary cup was removed from
piston, dip cup in brake fluid and
assemble cup over end of piston
from end shown, lip side first.
Dip hydraulic cylinder parts in
brake fluid and assemble in cyl-
inder bore in order shown. Lock
parts in place with snap ring,
making certain snap ring is
seated in ring groove. Place dia-
phragm in master cylinder res-
ervoir cover with raised side in
dome of cover and assemble
cover hand tight. See Figure
9-44.
2. If rear bearing seal is to be
replaced, use Installer J-9540 to
press bearing seal in rear shell
with plastic side up. See Figure
9-45.
3. Apply power brake lubricant
to O.D. of valve housing section
of power piston and to bearing
surfaces of air valve plunger and
to outer edge of floating control
valve. Insert air valve plunger
and rod assembly in valve hous-
ing of power piston. Press down
on valve rod to position air valve
plunger in housing and align
groove in valve plunger with slot
in power piston.
Insert air valve plunger lock key
and assemble diaphragm on power
piston making certain diaphragm
is seated in the groove of piston.
Assemble air f i l t e r and air
silencer over valve rod and po-
sition in valve housing. Press re-
tainer on end of valve housing
using care not to chip plastic
housing. See Figure 9-46.
4. Coat outer bead of diaphragm
with talcum powder where it