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FRONT BRAKES (discs)
SPECIFICAT
ICNS
Di sc brakes
:
T
eves
.
Typ
e:
Fixed calli per with
2
~oaxial
pistons
.
Oi
a. of pistons:
48 m
m.
Disc
Ma
t
erial
:
Cas
t
Iron
O
uter
diameter:
249
~~
.
T hickness:
12.75
~m.
~.lini
mum
acceptable th
ickness after
grinding:
11
.75
rnm,
Brake
shoe
Lining
grad e:
Ferodo
556.
Total thickness
of
lini
Dg
• me
tal
backi ng
:
15
mm
.
Th
ickness
of
lin
i ng
a
l
o~e:
10
nm
.
~
i
~
i
]un
acceptabl
e thickness befo re
repbcement:
7
mm, inclusive of backing.
2
Eff
ective
fric tion
sur
face:
38
em
pe
r
l
ining
.
Front hub
I:\
a
t
eri
a
1
:
cas
t
i
ror:
.
Hub
grease capac
ity
(Shell
A
lv:onia fP 2):
39
to
46
g.
DESCRIPTION (Fig.
1)
The bral<:e
ass!nbly
is
comprised
of:
-
a
disc made integral
wit~
the
wheel
hub;
-
a
shee
t
me
tal
splash
shield
fastened to the
stub
axle,
and
prot
ec
ti
ng
tha
face
of the
disc
opposerl b
th
e
\~hzel
aga
inst proj
ections
1hil st provi
ding
ventil ation;
-
a cal
li
pe
r
fas
t
en~d
to
the
s
tub
axle.
Th
e
w
heel
hu
b
is
fit ted
on
2
taper
railer
bearings,
being
reta
in
ed lah
rall
y by
a sk irted
nut.
1
T
1e
calliper
is
compri
sed
of
two
ha lf-callipers
,
each
hcing comprised
of
:
•
a mov ing
p1ston
sli
ding
in th
e
bore;
a
ri
nl] sea
l
fi
lted
in a
·
J
roov2
i
n f1e
bo~·e
;
a dust
cover
he
ld
by
a me
tal
snap
ring;
•
a
brake
shoe,
with its
lining
moulded
on
a
metal
hackinl)
.
Oath
half- calli
pers
are made
integral
by
means
of
4
sc
r
ews
and
nuts.
Bot~
bor
es
ar
e
con
nected
by
r
:
1 e:1ns
of
2 intemal
channels.
Sealing
for
the joint face be tween 1alf-callipers
is
by means
of
two
1
0
1
r
ings
fitted
where both
idemal chan'lels
are
connected.
~oth
shoes are
hel
d
in
posit
i
on
by
means of
two
assembly rods
held
on the
cal
li
per by
means of
tw
o extens
ible
r
~
tainers
.
.\
cross-shapad sp
ri
ng cont ra
l
s
the return
of
t
he
shoes, and
prevents
t
he
occu
rrence
of any noise
or
vi
brat
ions
w
hen
they
are
no
t
in
use.
On
the
ot
her
ha:1d,
the
widt'l
of thi
s spring is
such that the
ri
sks
of
dam
age
to
the
disc
,
through
contact
with
the brake
shoe
back
i
n~
.
are
practi
call
y
elim
inated,
for the
backing plates come into
contact
with
the sp
r
ing
w
hen the lin
i
ngs
have
reached
a
m
inimu~
th
ickness,
which
corresponds to the
maxi
mum
acceptable
wea
r.
T
he
dri
ver
becomes nwa rc of
thi
s
maxi
mum
w
ea
r
throu
gh
a
substan
tial
inc
r
eas
e of
the
pres
su
re
r
equired
on
the
pedal
and a simultaneous
reduction
in
braking
effici
enc
y.
OPERATION
When
t he
brake
pedal
is
bein~
pressed,
the
hydraulic pressure
genera
ted
in
th
e
system is such
that
the
pistons in
coaxial
ali
gnment
apply,
through
t
he brake
shoes,
an equal and
opposed pressure
aga
inst
the
disc
,
t his
pressure being
propor
ti
onal
with the
pressure
ap;.J
1
i
ed
on
the
brake pod
a
l.
W
hen pressure
on t
he brake
pedco.l
is released,
the
resultan
t pressure
is
cancelled
,
and each ri
ng
seal,
w
hi
ch
had
been 'llodified in
shape
by the
displacement of the
pistons du
ring
brak
ing,
returns
to
its
initi al shape,
bringi
ng
each piston back
,
over
approxi
ma
t ely •
15
mm
.
Un~e
r
the effect
of
the
cross-shap
ed
spring
,
the
brake sho
es
are c
1
cared
from
the disc
to
the same
ext ent,
wh
i ch
corresponds
to
the
fu
nctional
cl
ea rance
between
di
sc and shoes
.
Thi
s
system al
so c0ns
ti
tutes an
autom
at
ic
take-u
p
system
,
whi ch
compensates fo
r lini
ng wea
r.
Reprint or
lranslation,
even
partial, is •lriclly
proh ib iled wilhout wrillen permission from CHRYSLER
FRANCE
CHRYSLER
160-lbOCiT-180
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