Power Brakes - AMC Rambler 1965 Technical & Service Manual

6
Fronl
Coble
Bell Cronk
Reor Coble
to
Eqch Side
Equolizer
Adiusting Nut
FIGURE
l4
- Porking Broke
Bellcronk
ond
Equolizer
Remove
the
horseshoe
spring
lock
from
lever. Pull
the coble
conduit out
of the
lever
hondle ond then
lift
coble
out of the
slot.
To
remove
the front coble,
follow
Coble
ond
Conduit
Loc k
the
procedure outlined obove
with
the exception
of
removing
the
lever
os-
sembly.
POWER
BRAKES
Power
broking
is
o
method
of
hy-
droulicolly opplying the wheel
broke
units
with power
supplied
by
o
pres-
sure differentiol
between
engine
voc-
uum
ond
otmospheric pressure.
It
is
octuoted ond controlled by
o
minimum
omount
of foot
pedol
pressure.
The
combined
vocuum power
unit
ond
moster cylinder
is
on integrol port
of the
broke
system.
Should
o
vocuum
foilure
occur,
the
vocuum
in the front
side
of the
dio-
phrogm
will
ollow the
operotor
to
moke 3
or
4 power opplicotions
before
the supply
is
completely
depleted.
The single diophrogm
type
power
broke is
o
self-contoined vocuum
hy-
droulic power broking
unit.
It
is
of
the
vocuum
suspended
type which
utilizes
engine intoke monifold vocuum
ond
BRAKES
AND
WHEELS
_
HUBS
AND
DRUMS
Compensoling Port
lnlet
Port
Secondory
Piston
Mounting
Stud
Trlgger
FIGURE 15 - Porking Broke Lever Assembly
Primory Pislon
Pislon Stop
Check Vq lve
Reoction Disc
FIGURE
I6
-
Cross
Sectionol
View
-
Power Broke
Assembly
Vocuum Possoge
Vocuum Port
Atmospheric
Port
Volve qnd
Rod
AssemblY
Air Filter
system,
outlined in the
Moster Cylinder
Section.
The vocuum
power diophrogm
ond
the
components
which
moke
up
the
vcrlve
ossembly
ore
connected
to
the
broke pedol through the volve operot-
ing
r"od
ond pedol
linkoge. The volve
operoting rod
is
connected to the volve
plunger which
moves
within
the
power
diophrogm ossembly.
A
volve
return
spring
returns
the volve plunger
ond
volve
rod to the
releosed
position
when
pressure
is
releosed
f
rom
the
broke pedol. The voive poppet is
of
the flexible
rubber
type ond is
sup-
ported by the volve body,
ln the
re-
leosed position,
the poppet
return
spring holds
the
poppet ogoinst
the
otmospheric
port
seot.
A
speciol beor-
ing ond seol
is used
to
seol
the
open-
ing
between
volve body
sleeve ond
the
reor end piote. Vocuum
is
supplied
to the
power unit through
o
vocuum
check
volve locoted
in the front
hous-
ing. Air for
operotion
is
odmitted
through the oir
fllter
locoted
within
the
volve housing sleeve.
A
rubber
volve
r,od
guord
keeps
dust
ond dirt from
en-
terlng the volve
housing.
A
seol
lo-
coted
in
the front
vocuum
chomber
seols
the
opening
between
lhe
vocu-
um
chomber
ond the
hydroulic piung-
er.
The hydroulic plunger forms
the
link
betr,veen
the
vocuum
power
dio-
phrogm
ossembly
ond the
hydroulic
piston
o{ the
hydroulic
cylinder.
Operotion
Releosed Position
With the engine
running ond
the
Rod
Seql
Push
Rod
Push
otmospheric pressure
for
its power.
lt
consists
of
the following three
bosic
sections combined
into o
single
unit;
A
vocuum
power chomber
which
consists
of o front
ond
o
reor shell,
o
diophrogm,
o
diophrogm plote,
o
hy-
droulic push rod, ond
o
vocuum dio-
phrogm return
spring.
A
mechonicolly octuoted
control
volve integrol with the vocuum
power
diophrogm which controls
the
degree
of
power broke opplicotion
or
releose
in
occordonce with
the foot
pressure
opplied
to
the volve
operoting
rod
through
the broke pedol
linkoge.
The
control
volve
consists
of o
single pop-
pet
with on
otmospheric
port ond
o
vocuum port.
The vocuum
port
seot
is
o
port
of
the volve body
ottoched to
the
diophrogm
ossembly.
The
otmos-
pheric
port
seot is
o port of
the
volve
plunger which
moves
within the
volve
housing ond vocuum power
diophrogm
ossembly.
A
Double-Sofety
Broke
hydroulic
t5&ti