1997 BMW 328i Cylinder 4
[x] Cancel search: Cylinder 4Page 291 of 759
Brake
rotor,
removing
and
installing
.
.
.
.
.
.
.
.
340-7
MASTER
CYLINDER
............
.
.
.
.
.
.
.340-7
Master
cylinder,
removing
and
installing
.
...
.
340-7
GENERAL
TROUBLESHOOTING
WARNING
-
"
Although
semi-metallic
and
metallic
Brake
friction
materials
in
Brake
pads
or
shoes
no
longer
con-
tain
asbestos,
they
produce
dangerous
dust
.
"
Brake
fluid
is
poisonous,
highly
corrosive
and
dangerous
to
the
environment
Wear
safety
glasses
and
rubber
gloves
when
working
with
Brake
fluid
.
Do
not
siphonBrake
fluid
with
your
mouth
.
Immediately
clean
away
any
fluid
spilled
on
painted
surfaces
and
wash
with
water,
asBrake
fluid
will
remove
paint
.
"
Always
use
new
Brake
fluid
froma
fresh,
un-
opened
container
.
Brake
fluid
will
absorb
mois-
ture
from
the
air
.
This
canlead
to
corrosion
problems
in
the
brakingsystem,
and
will
also
low-
er
the
Brake
fluid's
boiling
point
.
Dispose
of
Brake
fluid
properly
.
"
Do
notreuse
self-locking
nuts,bolts
or
fasteners
.
They
are
designed
to
be
used
only
once
and
may
failif
reused
.
Always
replace
them
with
new
self-
locking
fasteners
.
BMW
E36
models
areequipped
with
vacuum
power-assist-
ed
four-wheel
disc
brakes
with
an
integral
Antilock
Brake
Sys-
tem
(ABS)
.
Single-pistoncalipers
act
on
solid
or
vented
front
rotors
and
solid
rear
rotors
.
A
brake
pad
wear
sensor
for
each
axle
indicates
when
brake
padsneed
replacement
.
The
dual
drum-type
parking
brakesystem
is
integrated
with
the
rear
brake
rotors
.
NOTE-
M3
models
havevented
directional
Brake
rotors
on
the
rearaxle
as
well
ason
the
front
.
340
Brakes
BRAKES
340-1
GENERAL
.
.
.
.
.
.
.........
.
.
.
..........
340-1
BRAKE
BOOSTER
.........
.
.
.
.
.
...
.
.
.
.
340-8
TROUBLESHOOTING
.......
.
......
.
...
340-1
Brake
booster,
removing
and
installing
....
.
.
340-8
PARKING
BRAKE
.
.....
.
...
.
.
.
.....
.
.
.
340-10
BLEEDING
BRAKES
.
.
.
.
.
.
.
.
..........
340-3
Parking
brake,adjusting
.
.
.
.
.
.
.
.
.
.
.....
.
340-10
Pressure
bleeding
brakes
Parking
brake
shoes,
removing
and
installing
.
340-11(except
cars
with
AST)
.
.
.
.
.
.
.
.
.
...
.
.
.
.
.340-3
Parking
Brake
cable,
replacing
.
.
.
.
.
.
.
.
.
.
.
.
340-11
BRAKE
PADS,
CALIPERS,
ANTILOCK
BRAKE
SYSTEM
(ABS)
.
.
.
.340-11
AND
ROTORS
..........
.
.......
.
.
.
.
.
.
.
340-3
ABS
System
Inspection
.
...
.
.......
.
.
.
..
340-12
Brake
pads,
replacing
............
.
.
.
.
.
.
.
340-4
ABS
wheel
speed
sensors,
replacing
.
.
.
.
..
340-12
Brake
caliper,
removing
and
installing
.
..
..
.
340-6
TABLES
a
.
Brake
System
Troubleshooting
.....
...
.
.
.....
.340-2
b
.
Brake
Rotor
Reconditioning
Specifications
.
.....
.340-7
Brakeperformance
is
mainly
affected
by
three
things
:
the
leve¡
and
condition
of
the
brake
fluid,
the
system's
abilíty
to
create
and
maintain
hydraulic
pressure,
and
the
condition
of
the
friction
components
.
Air
in
the
Brake
fluid
will
make
the
Brake
pedal
feel
spongy
during
braking
or
will
increase
the
Brake
pedalforce
required
to
stop
.
Fluid
contaminated
by
moisture
or
dirt
can
corrode
the
system
.
Inspect
the
Brake
fluid
inside
the
reservoir
.
Ifit
is
dirty
or
murky,
or
is
over
a
year
old,
the
fluid
should
be
replaced
.
Visually
check
the
hydraulic
system
startingat
the
master
cylinder
.
To
check
the
function
of
the
master
cylinder
hold
the
brake
pedal
down
hard
with
the
engine
running
.
The
pedal
should
feelsolid
and
stay
solid
.
If
the
pedal
slowly
falls
to
the
floor,
either
the
master
cylinder
is
leaking
internally,
or
fluid
is
leaking
externally
.
If
no
leaks
canbe
found,
the
master
cylin-
der
is
faulty
and
should
be
replaced
.
Check
all
Brake
fluid
lines
and
couplings
for
leaks,
kinks,
chafing
and
corrosion
.
Check
the
Brake
booster
by
pumping
the
Brake
pedal
ap-
proximately
10
times
with
the
engine
off
.
Hold
the
pedal
down
and
start
the
engine
.
The
pedal
should
fa¡¡
slightly
.
If
not,
check
for
any
visiblefaults
before
suspecting
a
faulty
brake
booster
.
Check
for
strong
vacuum
at
the
vacuum
hose
fitting
at
the
booster,
and
check
the
non-retum
valve
for
one-way
flow
.
Worn
or
contaminated
brake
pads
will
cause
poor
braking
performance
.
Oil-contaminated
or
glazed
pads
will
cause
stopping
distances
to
increase
.
Inspect
the
rotors
for
glazing,
discoloration
and
scoring
.
Steering
wheel
vibration
while
braking
at
speed
is
often
caused
by
warped
rotors,
but
can
also
be
caused
byworn
suspension
components
.
TROUBLESHOOTING
Page 292 of 759
340-2
BRAKES
When
troubleshooting,
keep
in
mind
that
tire
inflation,
wear
and
temperature
can
affect
braking
and
suspension
.
See310
Front
Suspension
for
more
information
on
front
suspension
parts
inspection
.
Table
a
lists
symptoms
of
brake
problems,
their
probable
causes,
and
suggested
corrective
actions
.
Table
a
.
Brake
System
Troubleshooting
Symptom
1
Probable
cause
1
Repairs
Brake
squeal
a
.
Incorrectly
installed
brake
pads
or
a
.
Check
component
installation
.
parking
brake
shoes
b
.
Brakepad
carriers
dirty
or
corroded
b
.
Remove
brake
pads
and
clean
calipers
.
c
.
Brake
pad
anti-rattle
springs
faulty
or
c
.
Install/replace
anti-rattle
springs
.
missing
d
.
Brakepads
heat-glazed
or
oil-soaked
d
.
Replace
brake
pads
.
Clean
rotors
.
Replace
leaking
calipers
as
required
.
e
.
Wheel
bearings
worn
(noise
most
e
.
Replace
worn
bearings
.
See310
Front
Suspension
pronounced
when
turning)
or
330
Rear
Suspension
.
Pedal
goes
to
f
loor
when
braking
a
.
Brake
fluid
leve¡
low
due
to
system
a
.
Check
fluidlevel
and
inspect
hydraulic
system
for
leaks
signs
of
leakage
.
Fill
and
bleed
system
.
b
.
Master
cylinder
faulty
I
b
.
Replacemaster
cylinder
.
Low
pedal
after
system
bleeding
1
a
.
Master
cylinder
faulty
1
a
.
Replace
master
cylinder
.
Pedal
spongy
or
brakes
work
only
a
.
Air
in
brake
fluid
a
.
Bleedsystem
.
when
pedal
is
pumped
b
.
Master
cylinder
faulty
(interna¡
return
b
.
Replacemaster
cylinder
.
spring
weak)
c
.
Leaking
line
or
hose
unions
c
.
Repair
or
replace
lines
and
hoses
.
Bleed
system
.
Excessive
braking
effort
a
.
Brake
pads
wet
a
.
Use
light
pedal
pressure
to
dry
pads
while
driving
.
b
.
Brake
pads
heat-glazed
oroil-soaked
b
.
Replace
brake
pads
.
Clean
rotors
.
Replace
leaking
calipers
.
c
.
Vacuum
booster
or
vacuum
hose
con-
c
.
Inspect
vacuum
lines
.
Test
vacuum
booster
and
re
nections
to
booster
faulty
place
as
required
.
Test
vacuum
non-return
valve
for
one-way
air
flow
.
Brakes
pulsate,
chatter
or
grab
a
.
Warped
brake
rotors
a
.
Resurface
or
replace
rotors
.
b
.
Brake
padsworn
b
.
Replace
brake
pads
.
c
.
Brake
pads
heat-glazed
or
oil-soaked
c
.
Replace
brake
pads
.
Clean
rotors
.
Replace
leaking
calipers
.
Uneven
braking,
car
pulís
to
one
a
.
Incorrect
tire
pressures
or
worn
tires
a
.
Inspect
tire
condition
.
Check
and
correct
tire
pres-
side,
rear
brakes
lock
sures
.
b
.
Brake
pads
on
one
side
of
car
heat-
b
.
Replace
brake
pads
.
Clean
rotors
.
Replace
leaking
glazed
or
oil-soaked
calipers
.
c
.
Caliper
or
brake
pads
binding
c
.
Clean
and
recondition
brakes
.
d
.
Worn
suspension
components
d
.
Inspect
for
worn
or
damaged
suspension
compo-
nents
.
See
310
Front
Suspension
or
330
Rear
Sus-
pension
.
Brakes
drag,
bind
or
overheat
a
.
Brake
caliper
or
brake
pads
binding
a
.
Clean
or
replace
caliper
.(
b
.
Master
cylinder
faulty
b
.
Replacemaster
cylinder
.
WARNING
-
On
cars
with
All
Season
Traction
(AST),
special
BMW
service
equipment
is
required
to
properly
bleed
the
ABS/AST
system
.
For
safety
reasons,
the
brake
system
on
carswith
ABS/AST
must
not
be
bled
using
the
procedures
described
inthis
repair
group
.
BLEEDING
BRAKES
Brake
bleeding
is
usually
done
for
one
of
two
reasons
:
Ei-
ther
to
replace
oíd
brake
fluid
as
part
of
routine
maintenance
or
to
expel
trapped
air
in
the
system
that
resulted
from
open-
ingthe
brake
hydraulic
system
during
repairs
.
BLEEDING
BRAKES
Alwaysuse
new
brake
fluid
from
an
unopened
container
.It
is
important
to
bleed
the
entire
system
when
any
part
of
the
hydraulic
system
has
been
opened
.
On
cars
not
equipped
with
traction
control
(AST),
brake
system
bleeding
should
be
done
with
a
pressure
bleeder
.
On
cars
with
AST,
brake
bleed-
ing
should
be
done
by
an
authorized
BMW
dealer
.
WARNING
-
On
cars
with
All
Season
Traction
(AST),
special
BMW
service
equipment
is
requíred
to
properly
bleed
the
ABS/AST
system
.
For
safetyreasons,
the
brake
system
on
carswith
ABS/AST
must
not
be
bled
using
the
procedures
described
inthís
repair
group
.
Page 293 of 759
When
bleeding
the
brakes,
startat
the
wheel
farthest
from
4
.
Close
bleeder
screw
and
release
brake
pedal
.
Refill
the
master
cylinder
and
progress
in
the
following
order
:
brake
fluid
reservoir
and
proceed
to
rear
left
wheel
.
"
right
rear
brake
5
.
Proceed
with
the
remaining
wheels
using
the
order
list-
"
left
rear
brake
ed
earlier
.
"
rightfront
brake
"
left
front
brake
Pressure
bleeding
brakes
(except
carswith
AST)
1
.
Top
off
brake
fluid
in
reservoir
and
connect
pressure
bleeder
to
reservoir
.
Connect
bleeder
hose
and
bottle
to
right
rearcaliper
bleeder
screw
.
Pressurize
system
to
approximately
1
bar
(14
.5
psi)
.
BRAKES
340-
3
Tightening
Torques
"
Bleeder
screws
:
7
mm
screw
..........
..
.
.
.
.
......
5
Nm
(4
ft-Ib)
9
mm
screw
..........
..
.
..
.......
6
Nm
(5
ft-Ib)
BRAKE
PADS,
CALIPERS,
AND
ROTORS
CAUTION-
TheE36
front
brake
caliper
is
shown
in
Fig
.
2
.
The
rear
Do
not
exceed
a
pressure
of
2
bar
(29
psi)
when
brake
caliper
is
shown
in
Fig
.
7
.
pressure
bleeding
the
brake
system
.
Excessive
pressure
will
damage
the
brake
fluid
reservoir
.
Brake
pads
canbe
replaced
without
disconnecting
the
brake
fluid
hose
from
the
caliper
or
having
to
bleed
the
brakes
.
2
.
Have
a
helperhold
brake
pedal
down
.
The
rotors
can
be
replaced
without
disassembling
the
wheel
huband
bearing
.
Always
machine
or
replace
rotors
in
parts
.
3
.
Open
bleeder
screw
.
See
Fig
1
.
Have
helper
slowly
,
Replace
pads
in
sets
.
pump
brakes
about10
times
with
bleeder
screw
open,
holding
pedal
down
on
the
last
pump
.
When
escaping
WARNING-
fluid
is
free
of
air
bubbles,
close
bleeder
screw
.
"
Althoughsemi-metallicandmetallicbrake
friction
materials
in
brake
pads
or
shoes
no
longer
con
CAUTION-
tain
asbestos,
they
produce
dangerous
dust
.
Bleeder
hose
must
alwaysremain
submersed
in
"
Treat
all
brake
dust
asa
hazardous
material
.
the
clean
brake
fluid
whenever
the
bleeder
valve
is
open
.
"
Do
not
create
dust
by
grinding,
sanding,
orclean-
ing
brake
friction
surfaces
with
compressed
air
.
"
Breathing
any
brake
dust
can
cause
serious
dis-
eases
such
as
cancer,
and
may
result
in
death
.
Brake
pads,
replacing
This
procedure
is
applicable
lo
both
front
and
rear
brakes
.
Front
and
rear
brake
assemblies
are
basically
the
same,
ex-
cept
that
the
rear
brake
rotors
house
the
parking
brake
mech-
anism
1
.
Raise
car
andremove
wheels
.
WARNING
-
Make
sure
thecar
is
firmly
supported
onjack
stands
designed
for
the
purpose
.
Place
the
jack
stands
be-
neath
a
structural
chassis
point
.
Do
not
place
jack
stands
undersuspension
parts
.
2
.
Remove
plastic
caps
from
guide
bolts
and
then
remove
guide
bolts
.
See
Fig
.
3
.
0012113
3
.
If
applicable,
disconnect
brake
pad
wear
sensor
con-
Fig
.
1
.
Brake
caliper
bleeder
screw
(arrow)
.
nector
and
remove
wiring
from
its
holder
.
4
.
Remove
anti-rattle
clip
from
caliper
.
See
Fig
.
4
.
BRAKE
PADS,
CALIPERS,
AND
ROTORS
Page 297 of 759
Brake
rotor,
removing
and
installing
Brake
rotors
shouldalways
be
replaced
in
pairs
.
Fig
.
9
.
Brake
rotor
mounting
screw
(arrow)
.
3
.
Inspect
rotor
for
excessive
grooving,
cracks,
and
warp-
ing
.
Check
rotor
thickness
.
See
Table
b
.
4
.
Installation
is
reverse
of
removal
.
"
Clean
rotor
with
brakecleaner
before
installing
.
"
If
brake
fluid
hose
veas
removed
or
loosened,
brake
systemmustbe
bled
as
described
aboveunder
Bleeding
Brakes
.
BRAKES
340-
7
5
.
Once
brake
assembly
is
instalind,
depress
brakepedal
several
times
to
adjust
caliper
and
pads
.
"
Pedal
should
feel
firm
and
be
at
proper
height
.
"
Check
fluid
leve¡
.
Top
up
if
necessary
.
NOTE-
M3
models
use
directional
brake
rotors
and
mustbe
in-
NOTE-
stalled
on
the
proper
side
.
Part
numbes
are
cast
finto
When
installing
new
rear
brake
rotors,
the
parking
therotors
.
A
part
that
ends
in
an
odd
number
is
a
left
brakeshouldbe
adjusted
.
See
Parking
Brake
.
rotor
.
One
that
ends
in
an
even
number
is
a
right
rotor
.
1.
Remove
caliper
as
described-above
and
hang
from
Tightening
Torques
chassis
using
stiff
wire
.
"
Brake
rotor
to
wheel
hub
..........
16
Nm
(12
ft-Ib)
"
Front
brake
caliper
to
steering
arm
...
110
Nm
(81
ft-Ib)
NOTE-
"
Rear
brake
caliper
to
traíling
arm
....
67
Nm
(50
ft-Ib)
Do
notloosen
caliper
brake
hose
.
"
Road
wheel
to
hub
...
..
.
100
±
10
Nm
(74
t
7
ft-Ib)
2
.
Remove
mountingscrew
holding
rotor
to
wheel
hub
.
,
See
Fig
.
9
.
Table
b
.
Brake
Rotor
Reconditioning
Specificati*M`
Front
Rear
Vented
rotor
wear
limit
(min
.
thickness)
20
.4
mm
(0
.803
in.)
Solid
rotor
wear
limit
(min
.
thickness)
8
.4
mm
(0.331
in
.)
M3
models
wear
limit
(min
.
thickness)
26
.4mm
(0
.977
in
.)
18
.4
mm
(0
.723
in
.)
Axial
runout
(max
.)
rotor
removed
0
.05
mm
(0
.002
in
.)
0
.05
mm
(0
.002
in
.)
rotor
installed
0
.20
mm
(0
.008
in
.)
0
.20
mm
(0
.008
in
.)
CAUTION-
M3
brake
rotors
must
not
be
machined
.
MASTER
CYLINDER
The
brake
master
cylinder
is
mounted
to
the
front
of
the
vac-
uum
booster
on
the
driver
side
bulkhead
.
Master
cylinder,
removing
and
installing
1
.
Using
a
clean
syringe,
empty
brake
fluid
reservoir
.
WARNING
-
Brake
fluid
is
highly
corrosive
and
dangerous
to
the
environment
.
Dispose
of
it
properly
.
NOTE-
On
original
equipment
rotors,
the
mínimum
allowable
2
.
Disconnect
brake
fluid
leve¡
sender
connector
from
fluid
thickness
is
stamped
on
the
rotor
hub
.
Measure
the
rotor
reservoi
r
cap
.
brakingsurface
with
a
micrometer
at
eight
to
ten
different
points
and
use
the
smallest
measurement
recorded
.
3
.
Disconnect
brake
fluid
lines
frommaster
cylinder
.
See
Fig
.
10
.
Disconnect
hydraulic
clutch
system
supply
line
.
4
.
Unscrew
mounting
nuts
and
remove
master
cylinder
from
brake
booster
.
5
.
Make
sure
all
nuts,
fluid
couplings,
thread
bores,
and
mating
surfaces
are
clean
.
MASTER
CYLINDER
Page 298 of 759
340-
8
BRAKES
Fig
.
10
.
Brake
fluid
linesat
master
cylinder
(arrows)
.
6
.
If
fluid
reservoir
was
removed,
install
it
carefully
using
new
sealing
grommets
.
7
.
Mount
master
cylinder
to
brake
booster
using
a
new
0-
ring
and
new
self-locking
nuts
.
CAUTION-
Use
cave
not
to
over-torque
the
master
cylinder
mounting
nuts
.
This
could
damage
the
brake
booster
and
prevent
proper
vacuum
build-up
.
0012164
8
.
Connect
all
brake
fluid
lines
.
Connect
hydraulic
clutch
hose
to
brake
fluid
reservoir
.
9
.
Reconnect
fluid
leve¡
sender,
and
bleed
entire
brake
systemas
described
earlier
.
BRAKE
BOOSTER
BRAKE
BOOSTER
The
brake
booster
is
mounted
to
the
bulkhead
on
the
driver
sideofthe
engine
compartment,
directly
behind
the
brake
master
cylinder
.
See
Fig
.
11
.
0015225
Fig
.
11
.
Brake
booster
(arrow)
.
A
is
vacuum
hose
from
intake
mani-
fold
.
B
is
one-way
valve
.
Intake
manifold
vacuum
acts
ona
large
diaphragm
in
the
brake
booster
to
reducebrake
pedal
effort
.
Brake
booster,
removing
and
installing
1
.
Disconnect
negative
(-)
cable
from
battery
.
CAUTION-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
vi¡¡
.
Tightening
Torque
"
Brake
master
cylinder
to
2
.
Using
a
clean
syringe,
empty
brake
(luid
reservoir
.
brake
booster
.....
..
.
..
.........
26
Nm
(18
ft-Ib)
WARNING-
"
Brake
fluid
hose
to
caliper
....
17-19
Nm
(13-14
ft-Ib)
Brake
fluid
is
highly
corroslve
and
dangerous
to
the
environment
.
Dispose
of
it
properly
.
3
.
Remove
brake
fluid
level
sender
connector
from
reser-
voir
cap
.
4
.
Disconnectbrake
fluid
lines
from
master
cylinder
.
Plug
openings
.
5
.
Disconnect
engine
vacuum
hose
from
brake
booster
.
Page 299 of 759
6
.
Disconnect
ABS
electrical
connectors
.
Label
and
then
disconnect
brake
lines
from
hydraulic
brake
unit
.
Plug
openíngs
.
See
Fig
.
12
.
~
~
A
1/
B
'1v
C
~
F
lu
11
-ri
J
.
0013244
A
.
Right
front
F
Front
from
master
cylinder
B
.
Leftfront
R
.
Rear
from
master
cylinder
C
.
Rear
Fig
.
12
.
Brake
fluid
linesat
ABS
hydraulic
unit
.
WARNING
-
"
On
cars
with
All
Season
Traction
(AST),
special
BMW
service
equipment
is
required
to
properly
bleed
the
Antilock
Brake
System
(ABS)
.
Removal
of
the
ABS
hydraulic
unit
is
not
recommended
un-
less
this
equipment
is
available
.
For
safetyrea-
sons,
the
brake
system
on
cars
with
ABS
must
not
be
bled
using
the
procedures
described
inthis
repair
group
.
"
Do
not
mix
up
the
fluid
fines
at
the
ABS
hydraulic
unit
Label
all
connections
before
disconnecting
.
7
.
Remove
ABS
hydraulic
unit
from
engine
compartment
.
8
.
Working
inside
car,
remove
panel(s)
frombeneath
steering
column
to
access
pedal
assembly
.
See513
In-
terior
Trim
.
12
.
Make
sure
al¡
nuts,
fluid
couplings,
thread
bores
and
mating
surfaces
are
clean
.
BRAKES
340-
9
0011261
Fig
.
13
.
Brake
pedal
clevispin
and
retaining
clip
(A)
.
Brake
booster
mounting
nuts
shown
at
arrows
.
13
.
If
necessary,
mount
master
cylinder
to
vacuum
booster
using
a
new
O-ríng
and
newself-locking
nuts
.
CAUTION-
Do
not
over-torque
the
master
cylinder
mounting
bolts
.
This
could
damage
the
brake
booster
and
prevent
proper
vacuum
build-up
.
14
.
Installation
is
reverse
of
Rmoval
.
"
Bleed
brakes
as
described
earlier
.
"
Check
and,
if
necessary,
adjust
brake
light
switch
above
brake
pedal
.
Tightening
Torques
"
Brakemaster
cylinder
to
brake
booster
...........
.
..
..
...
26
Nm
(18
ft-Ib)
"
Brake
booster
to
bulkhead
.
.
..
..
...
22
Nm
(16
ft-Ib)
"
Brake
fluidline
to
master
cylinder
or
ABS
hydraulic
unit
.......
.
..
17-19
Nm
(13-14
ft-lb)
9
.
Remove
clip
and
clevis
pin
from
brake
booster
pushrod
and
disconnect
it
from
brakepedal
.
Remove
brake
booster
mounting
nuts
.
See
Fig
.
13
.
NOTE-
10
.
Working
in
engine
compartment,
remove
brake
booster
When
replacing
the
brake
booster
one-way
valve
or
together
with
master
cylinder
.
vacuum
hose,
install
the
valve
so
that
the
molded
arrow
is
pointing
toward
the
intake
manifold
.
Use
new
hose
11
.
If
booster
or
master
cylinder
O-ring
is
being
replaced,
clamps
.
disconnect
master
cylinder
from
brake
booster
.
BRAKE
BOOSTER
Page 349 of 759
515
Central
Locking
and
Anti-Theft
GENERAL
.....
.
.
.
.
.
.
.
..:
.
.
.
......
.
.
.
.
515-1
Luggage
compartment
locking
actuator,
removing
and
installing
.
.
.
.
.
...........
.
515-6
DOOR
HANDLES
AND
LOCKS
.........
515-1
LOCKING
SYSTEM
AND
Front
door
lock,
removing
and
installing
....
.515-1
ELECTRONIC
IMMOBILIZATION
......
.515-7
Front
door
handle,
removing
and
installing
...
515-3
Rear
door
lock,
removing
and
installing
.....
515-4
Central
Locking
System(ZVM)
.
.
.
.
.......
.
515-7
Rear
door
handle,
removing
and
installing
...
515-5
Central
Body
Electronics
(ZKE
IV)
.
.
.......
.515-8
Electronic
Immobilization
System
(EWS)
.
.
.
.
.515-8
Door
striker,
rep
lacing
.
.
.
.
.
.
.
.
.
..........
515-6
EWS
II
control
module,
re
lacin
515-10
LOCKING
ACTUATORS
.
.
.
.
.
.
..........
515-6
Ring
antenna,
replacing
.
.
.
.
.
.
.
.
.
.
...
.
.
.
.
515-10
Door
Locking
Actuator
.
.
.
.
.
.
.
.
..........
515-6
EWS
II
transmitter/receiver
module,
replacing
...........
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
515-11
GENERAL
This
section
covers
repair
information
for
the
central
locking
and
the
anti-theft
systems
.
Keep
in
mind
that
E36
cars
are
CA
UTION-
equipped
with
sophisticated
and
self-diagnostic
electrical
sys-
Prior
to
disconnecting
the
battery,
read
the
battery
tems
.
When
experiencing
malfunctions
relatinglo
the
central
disconnection
cautions
given
at
the
front
of
this
locking
or
the
anti-theft
system,
it
is
recommended
that
the
manual
onpage
vi¡¡
.
systembe
diagnosed
using
the
BMW
service
tester
(DIS)
.
This
advanced
diagnostic
tool
can
usually
pinpoint
electrical
NOTE-
faults
quickly
and
safely
.
Consult
an
authorized
BMW
dealer
.
In
some
models
covered
inthis
manual,
it
is
not
essen-
tial
to
remove
the
side-impact
airbag
to
access
intemal
NOTE-
door
components
.
However,
the
procedure
is
recom-
Additional
general
electrical
information
can
be
found
mended
for
safely
reasons
.
i
n
610
Electrical
Component
Locations
and
Electri-
cal
Wiring
Diagrams
.
4
.
Disconnect
harnessconnector
from
window
motor
to
DOOR
HANDLES
AND
LOCKS
Front
door
lock,
removing
and
installing
1
.
Remove
front
door
panel
and
vapor
barrier
asde-
scribed
in
411
Doors
.
WARNING
-
Some
1997
and
all
1998
cars
are
fitted
with
side-im-
pact
airbags
in
the
front
doors
.
When
servicing
the
door
locks
on
cars
with
front
side-impact
airbags,
al-
ways
disconnect
the
negative
(-)
battery
terminal
.
See721
Airbag
System
(SRS)
forcautions
andpro-
cedures
relating
to
the
airbag
system
.
2
.
Raise
door
window
completely
CENTRAL
LOCKING
AND
ANTI-THEFT
515-1
3
.
On
cars
with
side-impact
airbags,
disconnect
negative
(-)
cable
from
battery,
then
remove
airbag
module
.
prevent
accidental
operation
.
5
.
On
4-door
cars
:
Peel
back
rubber
window
guide
from
reas
guide
rail
:
Remove
guide
rail
mounting
boltat
bot-
tom
.
Unclip
any
wiring
from
guide
rail
and
pull
guide
rail
downward
and
remove
from
door
.
See
Fig
.
1
.
NOTE
-
The
top
of
the
guide
rail
is
"hooked"
to
the
doorsheet
metal
.
6
.
Remove
inside
door
handle
retaining
screw
.
Discon-
nect
inside
handle
from
linkage
and
remove
.
See
Fig
.
2
.
7
.
Cut
wire
ties
and
remove
door
lock
electrical
harness
con-
nector
.
Remove
door
lock
mounting
screws
.
See
Fig
.
3
.
8
.
Working
inside
door,
disconnect
outside
door
handle
and
lockcylinder
linkage
from
door
lock
.
Remove
lock
from
inside
door
.
See
Fig
.
4
.
DOOR
HANDLES
AND
LOCKS
Page 355 of 759
002262
In
this
system,
three
microswitches
are
operated
via
the
door
lock
cylinder
at
each
front
door
.
Turning
the
key
approximately
Fig
.
17
.
Pufl
off
luggage
compartment
lock
actuating
rod
in
the
direc-
45°
(position
1)
operates
the
door
locking
microswitch
.
Tuming
tionof
arrow
.
the
key
approximately
90°
(position2)
actuates
the
double
locking
microswitch
.
Tuming
the
key
approximately
45°
in
the
opposite
di-
rection
through
position
0
actuates
the
unlocking
microswitch
and
deactivates
the
alarm
system
(position3)
.
See
Fig
.
19
.
Fig
.
18
.
Luggage
compartment
actuatorwire
connectors
and
attach-
ing
screws
(arrows)
.
LOCKING
SYSTEM
AND
ELECTRONIC
IMMOBILIZATION
The
central
locking
system
uses
electrical
lock
actuators
at
each
door
and
at
the
trunk
lid
.
The
locking
system
can
be
ac-
tuated
by
either
front
door
lock
or
by
the
luggage
compartment
lock
.
Onsome
1994
and
later
cars,
an
additional
remote
con-
trol
keypadcan
also
be
used
to
activate
the
lock
and
anti-theft
systems
.
When
the
key
is
tuned
to
the
lock
position,
a
micro-switch
signals
a
central
control
module
to
lock
all
doors,
luggage
compartment,
gas
tank
flap
and,
in
later
convertibles,
the
glove
box
lid
.
Where
applicable,
this
also
arms
the
anti-theft
system
.
CENTRAL
LOCKING
AND
ANTI-THEFT
515-7
NOTE-
The
central
locking
system
responds
to
accidents
vía
animpact
(inertia)
switch
.
When
this
function
ís
activat-
ed,
the
doors
are
automatically
unlocked
and
the
haz-
ard
warning
lights
and
interiorlights
are
turned
on
.
The
impact
switches
are
mounted
in
the
left
and
right
foot-
wells
behind
the
speaker
grilles
.
Central
Locking
System
(ZVM)
Different
versions
of
the
central
locking
control
havebeen
used
in
the
E36
cars
.
In
early
production
cars
(model
years
1992
and
1993),
the
locking
system
is
controlled
through
the
central
locking
module
.
This
system
is
referred
to
as
ZVM
.
Fig
.
19
.
ZVM
door
lock
cylinderpositíons
.
CAUTION-
Do
not
engage
double
locking
position
with
pas-
sengers
in
the
car
unless
the
master
key
isavail-
able
.
The
door
cannotbe
opened
from
outside
orinside
without
the
master
key
.
NOTE-
In
case
of
a
discharged
battery,
the
car
can
still
be
locked
orunlocked
using
the
key
.
0011762
LOCKING
SYSTEM
AND
ELECTRONIC
IMMOBILIZATION