PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —81— 22-01691 (R02/02)
To apply all your parking brakes, pull the yellow knob Out. The
parking brakes will set. And the trailer air supply valve (red octagon
knob) will automatically pop out, releasing air pressure and setting the
trailer brakes.
To release your truck or tractor brakes ONLY, push in the yellow
knob. Your trailer will remain parked.
• To release the trailer brakes ONLY, push in the red knob. The truck
or tractor will remain parked.
WARNING! Do not leave the cab without applying the park-
ing brake. The truck could roll and cause an injury acci-
dent. Always apply the parking brake before you leave the
cab.
WARNING! Stopping with the parking brake controls
can cause a sudden wheel lock-up, loss of control, or
can cause you to be overtaken by following vehicles.
You could be severely injured. Never pull out the park-
ing brake valve while the vehicle is moving.
WARNING! Do not use the trailer hand brake or service
brakes to park and hold an unattended vehicle—use the
parking brakes. Because service brakes work with air pres-
sure, these brakes could slowly release. Your vehicle could
roll, causing a serious accident. Someone could be hurt or
killed. Never rely on the service brakes to hold a parked
vehicle.
WARNING! Never drive your vehicle with the parking brake
applied. Always release the parking brakes prior to moving
the vehicle. Failure to disengage the parking brakes prior
to moving your vehicle could result in excessive heat build-
up in the brake system, resulting in a fire.
NOTE: Today’s diesel electronic engines have significant
torque and startability power at low RPM. Combinations of
engine speed and available torque may over-power the vehi-
cle’s parking brakes.
CAUTION: Do not try to put the vehicle in motion before
pressure in the system reaches 100 psi (689 kPa) because
the wheels are locked by the spring brake action. Unneces-
sary stress and possible brake malfunction could occur if
the vehicle is forced to move before the air system reaches
100 psi (689 kPa).
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