freightliner Run Smart ARGOSY, Driver Manual

Page: 94 / 166

•
When the ignition key is turned to the ON posi-
tion, the trailer ABS warning indicator will illu-
minate momentarily, then turn off.
•
If the lamp illuminates momentarily during ve-
hicle operation, then shuts off, a fault was de-
tected and corrected.
•
If the lamp illuminates and stays on during ve-
hicle operation, there is a fault with the trailer
ABS. Repair the trailer ABS system immedi-
ately to ensure full antilock braking capability.
IMPORTANT: If a compatible trailer is con-
nected, and the lamp is not illuminating momen-
tarily when the ignition key is turned to the ON
position, it is possible that the lamp is burnt out.
Automatic Traction Control
Vehicles with electronic engines and ABS may have
Automatic Traction Control (ATC). On these vehicles,
the ATC system automatically limits wheel spin dur-
ing reduced-traction situations. In normal braking ap-
plications, the standard air brake system is in effect.
An additional solenoid valve is installed. During
reduced-traction situations, the ATC solenoid valve
controls air pressure to the modulator valves and
they in turn increase, hold, or reduce pressure to the
appropriate brake chambers to provide better traction
whenever wheel spin occurs.
When the ATC system is in the NORMAL mode, it
will apply gentle braking to the spinning wheel, to
feed power to the wheel(s) with better traction. If
both wheels are spinning, the system will signal the
engine to reduce power.
ATC includes a deep snow and mud option to in-
crease available traction on extra-soft surfaces like
snow, mud, or gravel. A rocker switch labeled ATC is
located on the dash. See
Fig. 12.4 . Pressing the
switch temporarily allows more drive wheel spin. Acti-
vating the deep snow and mud option causes the
WHEEL SPIN lamp to flash. Pressing the switch
again cycles the system back to normal operation.
NOTICE
The deep snow and mud option is intended to be
used under specific slippery conditions that re-
quire momentary increased wheel spin. Using
this option for an extended period of time may
damage the vehicle brake system.
After the ignition switch is turned on, the vehicle ABS
lamp and the WHEEL SPIN indicator lamp come on
for about three seconds. After three seconds, the
warning lights go out if all of the tractor’s ABS com-
ponents are working.
IMPORTANT: If any of the ABS warning lights
do not work as described above, or come on
while driving, repair the ABS immediately to en-
sure full antilock braking capability.
Engine Brake
WARNING
To avoid injury from loss of vehicle control, do
not activate the engine brake system under the
following conditions:
•
on wet or slippery pavement, unless the
vehicle is equipped with antilock braking
system (ABS) and you have had prior expe-
rience driving under these conditions;
•
when driving without a trailer or pulling an
empty trailer;
•
if the tractor drive wheels begin to lock, or
there is fishtail motion after the engine
brake is activated.
Each engine manufacturer uses a specific engine
brake for their engine. Regardless of the manufac-
turer, the engine brake is operated with the principles
outlined in this chapter. Refer to the engine manufac-
turer’s operation manual for details of their particular
engine brake product.
f611180 04/24/2012
Fig. 12.4, ATC Switch
Brake System
12.5