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Fig
.
2
Fig.
3
Fi g.
4
POWER BRAKE (Master- Vac)
I
G.061
G.062
G.06
3
3
The
pressure differenti al, which is t hen
established between
both
chambers
(d
and c),
causes
the displacement of
dri
vi
ng
piston
(1)
and
push-rod
(2)
,
wh ich
actua tes the
hydraulic
master-cylinder.
Wh en
hydraulic pressure
is
being
applied
by
the
m aster-cylin der,
a
force
of
reaction is
applied
against
push-rod
(2), then,
through
rubber
reaction
plate
(5)
,
agai
nst plunger (4), which
tends
to
plug
the
opening to the
atmosphere
(b),
and
to open
vacuum
ho
le
(a)
.
This
force
of
react
ion
,
w
hich is oppos
ed
to
the
pressure
app
lied by th
e dri
ver
on
the
brake
pedal,
allows
the
driver
toc
ontrol
and
evaluate the
press ure he
has to
apply.
The
force
of
r eacti
on
is in proportion
to
the
hydraulic pressure present
in the system.
-
Holding position (Figs
. 1
and
4
)
Du
ri
ng
t he
braking
operation, w hen
the
dri
ver
keeps
the pressure constant
on
the brake
pedal,
the
force
of
reaction
co
mp
resses react
ion
pl ate
(5),
which
changes
shape, enters
cavity
(e)
, and
pushes
pl
ung
er
(4)
aga1nst
flap valve
(7
).
\
When
this displacement
is
achieved,
both
atmosphere and vacuum
holes
(a and
b)
are
closed,
and
t
hE
power-brake is
then
said
to be in
the
"holding position" or
"balance
position".
-
Return to
rest
posl
tion
(Figs
.
1
and 2)
When
the
brake
pedal is
released,
control rod
(6)
driven
back
by
its spring
(ll),
drl ves
al
so
plunger
(4), w
hich
then
plugs
op
enin
g to th
e
atmosphere (b),
and oper.s vacuum ho
l
e
(a).
T
hen,
both
chambers (c
and d) are again
communicat
ing,
the
va~uum
effect is
re-establi
shed
on
either
side
of dri ving
piston (l)
w
hic h,
•
con
trolled by
Its spring (3),
retums to
'
ts
rest
position.
Note:
when
t
he
engine is
no
t
running,
or
in
case
of
a break-down in
t he
source
of
the
vac uum
,
the
master-cylinder is
directl
y controlled
through
the
comb
inati
on
of
th
e
control
rod
(6),
plunger (4),
·
reaction
pl
ate
(5),
and
push-rod
(2).
It will
be
clear
tha
t braking, th en,
requires
a
greater
pressure to be
applied on
the brake pedal.
Repri
nt
o
r translat
io
n, even partial,
is
strictly prohibited without written permission
from
CHRYSLER FRANCE
CHRYSLER
160- 160 GT- 180
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