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STARTING AND DRIVING
448
Foot brake
The foot brake is part of the brake system.
The car is equipped with two brake circuits. If
a brake circuit is damaged, the brake pedal
will engage deeper. Higher pressure on the
pedal will therefore be needed to produce the
normal braking effect.
WARNING
The brake servo only works when the elec-
tric motor or internal combustion engine is
running.
If the foot brake is used when the car is
switched off, greater pedal pressure is
required to brake the car.
In very hilly terrain or when driving with a
heavy load the brakes can be relieved by using
engine braking in gearshift mode B.
Anti-lock braking system
The car has anti-lock brakes (ABS
2
), which
prevents the wheels from locking while brak-
ing and allows maintained steering control.
Vibration may be felt in the brake pedal when
this is engaged and this is normal.
A short test of the ABS system is made auto-
matically after the car has been started when
the driver releases the brake pedal. A further
automatic test of the system may be made at
low speed. The test may be felt as pulses in
the brake pedal.
Light braking charges the hybrid
battery
The electric motor's engine brake is used dur-
ing light braking. The car's kinetic energy is
then converted to electrical energy instead,
which is used to charge the hybrid battery.
Battery charging with electric motor braking is
indicated in the driver display.
The driver display indicates charging during electric
motor braking.
This function is active in the speed interval
1505 km/h (933 mph). During heavier brak-
ing, as well as outside the speed interval, brak-
ing is supplemented by the hydraulic brake
system. The driver's display shows this by the
indicator being down in the red zone.
Symbols in the driver display
Symbol Specification
Check the brake fluid level. If the
level is low, fill with brake fluid
and check for the cause of the
brake fluid loss.
Fault in pedal sensor.
Constant glow for 2 seconds
when the engine is started: Auto-
matic function check.
Constant glow for more than 2
seconds: Fault in the ABS sys-
tem. The car's normal brake sys-
tem is still working, but without
the ABS function.
If the message Brake pedal
Characteristics changed Serv-
ice required is shown, the sys-
tem for "Brake-by-wire" is disen-
gaged. A higher pedal pressure is
required to produce braking
effect.
2
Anti-lock Braking System
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