Foot Brake - Volvo XC 90 Owner's Manual

Foot brake

The foot brake is used to reduce the car's speed
while driving.
Foot 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 brak-
ing effect.
The driver's brake pedal pressure is assisted by a
brake servo.
WARNING
In a de-energised car with the electric motor
and fuel-driven engine switched off it is not
possible 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 manual gear position B. Use
drive mode for increased engine braking while
driving on steep downhill gradients at low speeds.
Anti-lock braking system
The car has anti-lock brakes, Anti-lock Braking
System (ABS), which prevent the wheels from
locking while braking and allows maintained
steering control. Vibration may be felt in the
brake pedal when this is engaged and this is nor-
mal.
A short test of the ABS system is made automat-
ically after the engine has been started when the
driver releases the brake pedal. A further auto-
matic test of the system may be made when the
car reaches 10 km/h. The test may be experi-
enced as pulses in the brake pedal.
Light braking charges the hybrid battery
The electric motor's engine brake is used during
light braking. The car's kinetic energy is then
converted to electrical energy instead, which is
used to charge the hybrid battery. Battery charg-
ing with engine braking is indicated in the driver
display, see the section "Hybrid related informa-
tion in the driver display".
This function is active in the speed range
150-5 km/h. During heavier braking, as well as
outside the above speed range, braking is sup-
plemented by the hydraulic brake system.
Off Road
The driver display indicates charging during engine brak-
ing.
STARTING AND DRIVING
Braking on wet roads
When driving for a prolonged period of time in
heavy rain without braking, the braking effect may
be delayed slightly when next using the brakes.
This may also be the case after a car wash. It is
then necessary to depress the brake pedal more
forcefully. You should therefore maintain a
greater distance to the vehicles in front.
Brake the car firmly after driving on wet roads or
using a car wash. This warms up the brake discs,
enabling them to dry faster and protecting them
against corrosion. Bear in mind the current traffic
situation when braking.
Braking on salted roads
When driving on salted roads, a layer of salt may
form on the brake discs and brake linings. This
may extend braking distance. You should there-
fore maintain an extra large safety distance to
vehicles in front. In addition, make sure you do
the following:
•
Brake now and again to remove any layer of
salt. Make sure that other road users are not
put at risk by the braking.
•
Gently depress the brake pedal after finish-
ing driving and before starting your next trip.
Maintenance
To keep the car as safe and reliable as possible,
follow the Volvo service intervals as specified in
the Service and Warranty Booklet.
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