Brakes - Volvo 9700 Manual

Brakes

Electronic brake system
The electronic braking system (EBS)
complements the regular, pneumatic
braking system. EBS ensures that the
bus obtains optimum brake effect.
Whereas pneumatic brakes divide the
braking power according to a specific
pattern, vehicles equipped with EBS are
braked independent of one another as
required by each traffic situation.
EBS compensates for factors that impact
the brake effect, such as slippery road
surfaces. In emergency situations, EBS
helps reduce the response time as well
as maximising the road grip to obtain the
shortest possible braking distance.
Anti-lock brake system
Anti-lock brake system (ABS) is a
system for preventing the wheels from
locking while braking.
ABS is a part of the EBS system and is a
fully automatic function.
When the ABS is active, a symbol is
shown in the driver information display.
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Electronic stability program
Electronic stability program (ESP) is a
system that reduces the risk of the bus
overturning or skidding.
If the system senses that the bus is
about to overturn, the throttle is reduced.
If it is not sufficient, the the system also
uses the wheel brakes to reduce the bus'
speed.
If the system senses that there is a risk
of skidding, the throttle is reduced and
the wheels are braked. If necessary, the
retarder is also disengaged.
When the ESP is active, a symbol is
shown in the instrument cluster.
WARNING
The bus can still overturn during wreckless
driving. On a slippery road surface, the
bus can skid despite ESP.
When the accelerator is released on a
slippery road, the retarder may lock the
driving wheels. The retarder is then
disengaged and the engine powers the
driving wheels until they rotate at the
same speed as the front wheels.
This function will not work if the gearbox
is declutched, the ABS is active, or if the
speed is lower than 10 km/h.
When the brake pedal is pressed fast
and forcefully, the braking pressure is
higher and the braking effect stronger.
This function enables fast application of
the full braking force in emergency
situations.
NOTE
This function works during gentle braking.
During harder braking the braking force is
divided so that braking occurs as
effectively as possible.
Brake assist function
The brake assist function is designed to
obtain full braking force faster in an
emergency situation. If the brake pedal is
suddenly depressed, the brake pressure
increases and brakes more powerfully.
High brake temperature
warning
If the temperature on the brakes
becomes too high, the CHECK lamp is
illuminated and a symbol is shown in the
driver information display. When the
temperature is too high, the brake pedal