Volvo XC90 2019 Owner's Manual page 470

STARTING AND DRIVING
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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
150-5 km/h (93-3 mph). During heavier brak-
ing, as well as outside the speed interval, brak-
ing is supplemented by the hydraulic brake
2 Anti-lock Braking System
468
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.
WARNING
If both the warning lamps for brake fault
and ABS fault illuminate at the same time,
a fault has occurred in the brake system.
If the level in the brake fluid reservoir is
•
normal at this stage, drive carefully to
the nearest workshop and have the
brake system checked - an authorised
Volvo workshop is recommended.
If the brake fluid is below the MIN level
•
in the brake fluid reservoir, do not drive
further before topping up the brake
fluid. The reason for the loss of brake
fluid must be investigated.
Related information
Brake assistance (p. 469)
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Automatic braking when stationary
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(p. 473)
Help when starting on a hill (p. 475)
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Braking on wet roads (p. 469)
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Braking on gritted roads (p. 469)
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Brake system maintenance (p. 470)
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Brake lights (p. 162)
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