operators_manual

speed should be reduced to eliminate
wheel spin and prevent excessive
application of the A
TC system. Except for
checking for proper illumination of the ABS
and traction control warning lamps when
first starting the vehicle, and for monitoring
these lamps while driving, no special
operating procedures are required. For
detailed system description, see literature
for your specific ABS that was provided
with your vehicle.
Antilock Brake Systems (ABS)
This vehicle may be equipped with an
ABS, which reduces the possibility of
wheel lock-up. If a wheel is about to lock
during braking, the ABS will automatically
adjust air pressure to the brake chambers
on the appropriate wheel(s) to prevent
wheel lock-up. The ABS is automatically
turned on when the ignition switch is turned
on.
WARNING
The antilock brake system is a critical
vehicle safety system. For the safety
of you and others around you, have
the vehicle submitted for periodic pre-
ventive maintenance checks as well as
having any suspected problems imme-
diately
checked by an authorized deal-
er. Failure to properly maintain your
brake system can lead to serious acci-
dents. Failure to comply may result in
property damage, personal injury, or
death.
WARNING
DO NOT rely on an antilock brake sys-
tem
that is functioning improperly. You
could lose control of the vehicle result-
ing in a severe accident, causing per-
sonal injury or death. If your ABS lamp
goes on while you are driving or stays
on after the self-check, your anti-lock
system might not be working. The ABS
may not function in an emergency. You
will still have conventional brakes, but
not antilock brakes. If the lamp indi-
cates a problem, have the ABS
checked.
Vehicles without ABS are typically
equipped with a bobtail brake proportioning
system. When a trailer is not connected,
the drive axle brake application pressure
will automatically be limited by the
proportioning system. When driven in a
bobtail mode, these tractors will require
greater brake pedal application to provide
the equivalent braking to a bobtail tractor
not equipped with a proportioning system.
T
railer ABS Power Line
Communication (PLC)
North American on-highway vehicles are
equipped with a separate electrical circuit
to power the ABS on towed vehicle(s). In
most cases, the ABS power will be
supplied through the Auxiliary circuit on the
primary 7-way trailer light line connector. If
the vehicle was manufactured with a
switchable Auxiliary circuit for trailer
accessories, an additional 7-way connector
would have been provided for trailer ABS
power. In either case, the ABS power line
on the vehicle will be PLC equipped.
CAUTION
DO NOT splice into the non-switchable
Auxiliary circuit on the primary 7-way
trailer light line. Doing so may cause
the trailer ABS to malfunction. This cir-
cuit is dedicated for trailer ABS power.
To add a switchable auxiliary circuit,
contact a dealership.
DRIVING - Brakes
162 Y53-6110-1A1 (01/21)
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