PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —82— 22-01691 (R02/02)
• To release the full combination of brakes, push in BOTH yellow
and red knobs.
Trailer Air Supply Valve
The red octagon knob controls the air supply to the trailer. To supply
air to the trailer system and release the trailer parking brakes:
• Allow the tractor air system pressure to build up to operating level.
• Push the red knob in.
• Hold the red knob in by hand until the trailer air pressure builds to
a pre-set level, about 45 psi. At this point, it will remain in.
The yellow knob will remain out; the tractor will remain parked. If you
ever have a failure or disconnect of the air supply hose to the trailer,
the trailer parking brakes will set. The red knob will automatically pop
out and seal off the tractor air reservoirs to protect the tractor air sys-
tem pressure.
When operating the tractor “bobtail”: The red knob must remain out
to protect the tractor air system pressure.
Retarders
Various retarders are available which function against the engine,
driveline, or transmission. These are devices that use your engine’s
power to slow down your vehicle. They save wear and tear on your
service brakes and can be a safety feature, too, because they can
keep your brakes from overheating.
Ideally, you should always slow your vehicle with your retarder and
use your service brakes only for stopping completely. Operating this
way will greatly prolong the life of your brakes.
WARNING! In an emergency, the retarder might not stop
you fast enough to prevent an accident. You could be
badly hurt if you relied only on your retarder. Use the
service brakes for quick stops. The retarder is not an
emergency brake.
WARNING! The retarder is NOT intended as the primary
brake for the vehicle, nor is it an emergency brake. The
retarder only helps the service brakes by using pressure to
slow the drivetrain. Use the service brakes for quick stops.
WARNING! The service brakes must be used in an emer-
gency. The retarder alone might not stop you fast enough
to prevent an accident. You could be badly hurt if you relied
only on the retarder.
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