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Brakes 237
During emergency or reduced-traction
stops, fully depress the foot brake pedal un-
til the vehicle comes to a safe stop. DO
NOT PUMP the brake pedal. With the
brake pedal fully depressed, the ABS will
control all wheels to provide steering con-
trol and a reduced braking distance.
Although the ABS improves vehicle control
during emergency braking situations, the
operator still has the responsibility to
change driving styles depending on the
existing traffic, road and/or weather condi-
tions. For example, the ABS cannot prevent
an accident if the driver is speeding or fol-
lowing too closely on slippery surfaces.
The ABS control unit contains a self-
testing program that is engaged each time
the ignition is turned on. The operator can
verify the testing by listening for the ABS
modulator valves actuating twice in series.
To increase the sound, hold down the foot
brake pedal when the ignition is turned on.
The self-test is not finished and the telltale
will stay on until the vehicle has started to
move. The wheel speed sensors are tested
when the vehicle starts to move. If they test
OK, the telltale will go out at approxi-
mately 7 mph (11 km/h).
WARNING
If any of the ABS telltales come on dur-
ing driving or do not go out after a short
time after turning on the ignition, take
the vehicle to a Volvo Truck dealer to
repair the ABS or brake system. The ve-
hicle can still be driven with a problem
in the ABS system. However, ABS will
not be working and the standard braking
system will be in effect.
W3000905