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BRAKE SAFETY AND EMERGENCY
PART 7: STARTING & OPERATING THE VEHICLE
– 120 –
Y53-6032
(05/10)
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 avail-
able torque may over-power the vehicle’s parking
brakes.
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.
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).
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.
• 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 pres-
sure 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 system
pressure. When operating the tractor “bobtail”: The red
knob must remain out to protect the tractor air system
pressure.
Y53-6032.book Page 120 Monday, May 24, 2010 3:37 PM
Содержание Peterbilt 587
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