Abs, Traction Control System (Tcs) & Electronic Stability Control (Esc); Antilock Braking System (Abs); Electronic Stability Control (Esc) - PREVOST X3-45 Commuter 2020 Operating Manual

5-28 Other Features
Action
Full force on the brake
pedal
WARNING
Do not use the retarder during inclement weather
or slippery road conditions.
NOTE
The stoplights automatically illuminate when
the vehicle is slowing down after application of
the transmission retarder.
NOTE
For vehicles equipped with the Antilock Braking
System (ABS), as the wheels start to lock up on
slippery roads, the
automatically deactivates until the wheels roll
freely.
ABS, TRACTION CONTROL SYSTEM
(TCS) & ELECTRONIC STABILITY
CONTROL (ESC)

ANTILOCK BRAKING SYSTEM (ABS)

The purpose of the Antilock Braking System
(ABS) is to maintain vehicle stability and control
during braking and to minimize the stopping
distance in any road condition.
On slippery roads and more generally in
emergency situations, over- braking frequently
induces wheel locking. Wheel locking greatly
increases breaking distance on any road surface.
Locked wheels also impede directional control
and cause severe tire abrasion. An antilock
braking system provides maximum braking
performance while maintaining adequate control
on slippery roads.
The basis of ABS is constant monitoring of wheel
parameters during braking. Sensors on each
wheel of the front, drive and tag axles constantly
measure wheel speed during braking. This
information is transmitted to a six- channel
electronic processor which senses when any
wheel is about to lock. Modulating valves quickly
adjust brake pressure (up to 5 times every
second) to prevent wheel lock. Each wheel is
DOB 1300-1556
Retarding Power
100% of total retarding
power
output retarder
PA-1639 Operator's Manual 2020 X3-45 Commuter
therefore controlled according to the available
grip.
In this way, the vehicle is brought to a stop in the
shortest possible time while remaining stable and
under the driver's control.
WARNING
Vehicles following ABS- equipped vehicles may
not be able to brake as fast on slippery roads.

ELECTRONIC STABILITY CONTROL (ESC)

The Electronic Stability Control (ESC) is a feature
for ABS-equipped vehicles that reduces the risk
of rollovers and loss of control. The ESC system
features include the RSP Roll Stability Program
and Yaw Control.
The RSP system counteracts the tendency of a
vehicle to tip over while changing direction
(typically, while turning).
To reduce the risk of rollover, the RSP system
detects potential rollover conditions and slows
the vehicle both by reducing engine throttle (and
hence, engine torque) and by applying service
brakes as needed at the appropriate wheels.
WARNING
During an RSP system intervention, the vehicle
automatically decelerates. The RSP system can
slow the vehicle with or without you applying the
brake pedal, and even when you are applying the
throttle.
During an RSP system intervention, you can
always use your service brake pedal to increase
the braking pressure that will be applied.
However, if you were to apply less braking
pressure than needed or even if you release the
brake pedal entirely during an intervention, the
RSP system will continue to apply the necessary
amount of braking pressure automatically to the
appropriate wheels to mitigate a potential
rollover.
Yaw Control is a feature that reduces the risk of
loss of control. If a vehicle's tires start to slide
during a turn, Yaw Control counteracts the
tendency of that vehicle to spin (or yaw), thereby
reducing the risk of loss of control. Many factors,
including road conditions, load distribution and
driving behavior, can
development of a spin.
contribute to the