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5-16
BRAKEI-POWER
BENDIX
SERVICE PROCEDURES
Removal
(Fig. 191
(1) Disconnect the vacuum line from the vacuum
cylinder.
(2) Disconnect the hydraulic brake line from the
master cylinder.
(3) Under the instrument panel, disconnect the push
rod from the brake pedal linkage.
(4)
Remove the four attaching nuts from the brake
unit mounting bracket to dash and remove the unit
from the vehicle.
Disassembly
(1) Clean all dirt from the master cylinder cover
and remove the cover.
(2) Apply pressure to the power lever and insert a
Y8"
wire or rod in the large hole in the brake reservoir,
(3) Remove the master cylinder from the front end
of the vacuum assembly and remove the master cylin-
der push rod from the power brake unit.
BOLTS
(6)
REACTION DISC
- E
POPPET SPRING
VALVE RETURN
SPRING
retaining the master cylinder piston in the cylinder.
- - R E T A I
N ER
POPPET DIAPHRAGM
VALVE PLUNGER
( 4 )
Remove the cotter pin and clevis pin from the
upper end of the power lever (Fig. 19).
(5) Remove the rubber dust cover from the valve
rod.
(6) Scribe alignment mark across the end plate and
the vacuum cylinder to assure proper reassembly.
(7) Remove 6 of the
8
end plate attaching screws
leaving the
2
remaining screws opposite each other.
(8)
Place the vacuum unit on the bench with the end
plate up.
(9) Apply light hand pressure to the end plate
to hold the piston and return spring in place then
re-
move the
2
remaining end plate attaching screws.
(10) Relax the retaining pressure on the end plate
and expose the vacuum piston.
(11) Scribe alignment mark on the face of the pis-
ton to coincide with the cover and cylinder scribe
mark, to insure alignment on reassembly.
(12) Remove the vacuum hose from the end plate
and the vacuum piston.
(13) Remove the end plate, piston and the piston
return spring.
(14) Remove the air cleaner attaching screws, air
cleaner assembly and filter from the end plate.
(15) Remove the piston felt and expander ring from
the piston assembly.
(16) Refer to Fig. 20 remove the seal and bumper
from the front of the piston plate.
(17) Place inverted piston assembly on two wood-
en blocks and remove the 6 piston plate bolts (Fig.
20). Hold the piston plates together by hand so the
poppet spring and valve return spring do not become
dislodged from their relative positions.
(18) Carefully separate the piston plates and re-
move the leather piston ring.
,
DIAPHRAGM
SUPPORT PLAT
REAR PISTON
WOOD BLOCKS
(2)
N Y
1374
Fig.
PO-Power Brake Piston Unit
(19) Remove the poppet spring (outer), valve return
spring (inner), poppet spring retainer, poppet dia-
phragm and the poppet.
(20) Using a blunt wooden rod, push out the rub-
ber reaction disc from the front piston plate.
Do not
separate valve operating rod and valve plunger, this
is serviced as a unit.
Cleaning
and
Inspection
Clean all the metal parts in a suitable solvent then
blow dry with compressed air (including recesses and
internal passages). Wash rubber parts in clean alcohol.
After parts are cleaned, place on clean paper or cloth
and inspect as follows:
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