operators_manual

Parking brakes work in reverse action of
the regular brakes. When the parking
brakes are engaged, air is exhausted from
the spring chambers, which allows the
spring to engage the brakes. This design
also provides a safety function if a brake
circuit has a leak and loses air. In such a
scenario, the parking brakes will apply.
The vehicle’s parking brake controls are
the yellow diamond shaped knob on your
dash board. If the vehicle is equipped to
tow a trailer, then there will be an additional
red octagon shaped knob for the trailer
parking brakes. Parking brakes will be
engaged when either of these knobs are
pulled OUT. (If one knob is pulled out, the
other knob will automatically pop out.)
Pushing IN a knob will disengage the
respective parking brakes. If you push in
the yellow knob only, you will disengage
the vehicle’s parking brakes but will not
disengage the trailer parking brakes (if
applicable). Either knob will pop back out if
the system pressure is not above 60 psi
(414 kPa). The instrument panel display
will provide a message any time the
parking brakes (vehicle or the trailer) are
set and the vehicle is put into motion.
See Also
Low Air Alarm
on page 30
Automatic Traction Control
General information on ABS and automatic
traction control.
Your truck/tractor ABS is equipped with an
automatic traction control (ATC) feature.
This feature is controlled by a switch on the
dash. Do not allow the traction control lamp
to remain on continuously for an extended
length of time. Extended continuous use of
the ATC can cause overheating of the drive
wheel brakes. Engine torque or vehicle
speed should be reduced to eliminate
wheel spin and prevent excessive
application of the ATC 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.
Anti-Lock Brake Systems (ABS)
Information on using the anti-lock brake
system.
This vehicle may be equipped with an anti-
lock braking system (ABS). This ABS
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 Anti-Lock Brake System is a critical ve-
hicle safety system. For the safety of you
and others around you, have the vehicle
submitted for periodic preventive mainte-
nance checks as well as having any sus-
pected problems immediately checked by
an authorized dealer. Failure to properly
maintain your brake system can lead to seri-
ous accidents. Failure to comply may result
in death, personal injury, equipment or prop-
erty damage.
DRIVING - Brakes
Y53-6096-1A1 (01/17) 107
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