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hydraulic
pressure.
Ihe
driver should
not
aitempt
lo
emulate
this prccess
by'pumping'the
brake pedal, as modulalion
in
lhis
mannerwill
treal
all
four
wheels similarly,
rather
than
individually
as afforded by
theABS eleclrcnics.
An
ABS lell lale lamp
in
lhe
anslrument panel
rs
provided
to
wam
thal
lhe
integral self diagnostic
systefi
has identified
a
prcblem, and
to
indicale that the anti-lock funciion has
been
turned
on
See
ABS
iell lale
lamp'.
Aril|iNnr
'
The amber ABS
tell tale
in
lhe instrument panel should
lightforabout 3seconds followlng
ignition switch
on,
and
then go out.
ll
the lamp remains
lit, or comes
on
whilst
driving,
a
fault
in
th€anti-lock brakesystem is indicated.
The
base
brake system
will conlinue
to operate
normally,
butwithout
the
anti-lockfeature.
Hoavy
braking,
or
brak-
ing on
slippery surfaces
may cause one
ormorewheels
to
lockand resultin
reduced
steering response
and
pos-
sible loss
of
control.
The
carmay
continueto
be
driven with appropriate
care
and
anticipation,
butshould
be
checked and repaired
at
the
earliesl opportunity.
'
The increased conlrol that ABS provides should not
induce
you to take
more risks with your
safety. ABS
will
not prevent
a
skid
caused
byabruptrteedng movements,
or
attempting to
comertoo quickly.
.
Always maintain a saf€ tollowing distance from other
vehicles relative to the
road
surface
and
weather condi-
tions.
'
ABS
doos not avoid the risk
of an
accident
due
to inap-
propriate
speed.
The
driver is al all times responsible
for
thejudgement
of
sale
speed,
'
The
control unit of the ABS is s€t for standard wheel
and
ilre sizes. lf non-standard wheels
or
tires
are
fiiled,
the
control unit
rnay
mis-interpret
the speed of the
cat
because of
the varian! data
it
receives
trom the wheel
gpeed
sensors. Fitting non-approved wheels or tkes
could seriously affect the performance
oItheABS.
.
Activation
of
lhe AgS
will vary according to the
level
of
grip available at the tires, On dry surfaces, activation
will occur only with
a
high pedal pressure. On
slippery
surfaces, only
a low
pedal
pressure
will
be
n€eded,
.
On
looie
or uneven
surfaces, such
as
gravel
or
snoq
a
carwith ABs
may
ne€d
a
longerslopping
dlstance-
allow
a
grsaler
following distance
in
lhese
conditions.
Hydraulic
Brake
Assisl {HBA)
Hydrautic Brcke
Assist,
1s
incorpo€led
into the
ABs
to
help
prcducethe
minimum stopping
distancewhen
eme€ency
btak-
ing
isdemanded. Byconlinuous
monitoring
ofthe
brake
prcssure,
the
ABS control
module is abl€
lo
idenlify
when
such an
event
occurs,
and
when
necessary
incrcases hydmulic
pressure up
to
the
anti'lock
activalion threshold,
thus
producing oplimum
controlled
btaking.
Electronic
Brake
Distribution
(EBD)
Thas
feature addrcsses the instability that could be
caused
under
heavy
braking due to the tendency of the
lightly loaded
rearwheels
to
lock
pt€maturely.
Eleclronic Brak€ Distribution is
incorporated
into
lhe ABS
lo
limit
ihe
rear
brake system hydraulic
pressure prior to any anti-lock intervention.
Electronic Differential Lock
{EDL)
lf
hard acceleration
is
demanded
in
conditions
oi va
able
surface grip,
orwhen
comering forces lesult
in a lightly loaded
inside
rear
wheel,
thee
will
be
a lendency for
d
ve torque to
overcome
the
grip available, resulling
in spinning
of the
lightly
loaded
wheel.
When this situation is
delected
by
theABS con-
trcller, btake pressurc
is applied to
the
spinning
wheel
in
order
to transfer
d
ve
toaque
to
lhe
opposite wheel,
lhus
maintaining
drjve and aiding vehicle siability.
See
also'Lotus
Traction Control' (page 91).
Electronic Stability Programme
(ESP)
Thjs
fealu€
enhances vehicle stability
in
extreme manoeuvres
typified by accidenl avoidance att€mpts or misjudged
come
ng
demands,
Current vehicle behaviour is conslanlly
monitored,
and compared with a
delenninalion
ofdriver
intent as indicated
by
data
gathered
from the driving
controls. When
vehicle
stabilily
is
al
sk,
theABS
is ulilised
to
apply a
measued
braking
force
to
individual wheels
as
necessary
in
oder
to
help the ddver
maintaln control of the vehicle.
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