safely, and use the system properly, could result
in personal injury and/or death and property
damage.
The roll stability control system automatically reduces
engine power, applies the engine brake, and/or ap-
plies the tractor and trailer brakes when the accelera-
tion sensor detects that the vehicle is at risk of rolling
over. The control can intervene even before an advi-
sory message is displayed.
The dash indicator light illuminates whenever the roll
stability control system intervenes.
Hard-Braking Advisor
The hard-braking advisor uses the information from
the ABS wheel speed sensors to determine when
braking is severe enough to produce lockup at one
or more wheels on the tractor, and/or very rapid ve-
hicle deceleration. Shortly after a hard-braking event
occurs, an advisory message is displayed in the
driver message center, indicating that the braking
behavior was too aggressive for the current road sur-
face conditions. This system is not a replacement for
a driver’s good judgment. Sometimes it is necessary
to brake hard.
From the highest risk level to the lowest risk level,
the system will sound an audible alert, and display a
message, as shown in
Fig. 12.5.
Trip/Leg Totals
The driver message center records the number of
messages received, and displays the number of
messages as counts. Roll stability advisor (RSA) and
hard-braking event data (HBED) counts can be
viewed in the trip advisory screen, and the leg advi-
sory screen.
Counts can be reset using the + key on the steering
wheel. Clearing RSA and HBED leg counts will also
reset the leg miles and leg hours. Clearing RSA and
HBED trip counts will also reset trip miles, trip hours,
leg miles, leg hours, and leg advisory counts. In ad-
dition, resetting leg miles will clear leg counts. Clear-
ing trip miles will reset miles, hours, and counts in
both the leg and trip screens.
The TRIP and LEG advisor screens count both the
roll stability advisories (ROLL) and hard-braking
events (BRK). For example, if during a TRIP, the
driver message center recorded the events in
Table 12.1, the message center would display as
shown in Fig. 12.6.
Message to Display
41
MessageMSG
No.
System Fault1
WARNING
RAC SYSTEM FAIL
ACTIVE SLOWING
ROLLOVER RISK
4 NoneRSC2
VERY HIGH RISK OF
ROLLOVER DETECTED
REDUCE SPEED
AT LEAST 11 KPH
REDUCE SPEED
AT LEAST 7 MPH
or in metric
19.6 10RSA Level 33
HIGH RISK OF
ROLLOVER DETECTED
REDUCE SPEED
AT LEAST 11 KPH
REDUCE SPEED
AT LEAST 7 MPH
or in metric
14 5RSA Level 24
ROLLOVER RISK
DETECTED
REDUCE SPEED
AT LEAST 11 KPH
or in metric
REDUCE SPEED
AT LEAST 7 MPH
8.4 2RSA Level 15
HARD BRAKING WITH
ABS ACTIVATED
LOOK AHEAD
BRAKE SOONER
14 0.5HBED Level 36
HARD BRAKING
DETECTED
LOOK AHEAD
BRAKE SOONER
14 0.5HBED Level 27
LOSS OF TRACTION
ABS ACTIVATED
ROAD SURFACE
MAY BE POOR
14 0.5HBED Level 18
07/25/2008 f040769
Display
Time:
Seconds
Buzzer
Time:
Seconds
Fig. 12.5, Roll Stability and Hard-Braking Warnings
Brake Systems
12.6
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