Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...
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Parking Brakes and Their Use<br />
PART 7: STARTING & OPERATING THE VEHICLE<br />
WARNING!<br />
• Do not leave the cab without applying the<br />
parking brake. The truck could roll and cause<br />
an injury accident. Always apply the parking<br />
brake before you leave the cab.<br />
• Stopping with the parking brake controls can<br />
cause a sudden wheel lock-up, loss of control,<br />
or can cause you to be overtaken by following<br />
vehicles. You could be severely injured.<br />
Never pull out the parking brake valve<br />
while the vehicle is moving.<br />
• Do not use the trailer hand brake or service<br />
brakes to park and hold an unattended vehicle—<br />
use the parking brakes. Because<br />
service brakes work with air pressure, these<br />
brakes could slowly release. Your vehicle<br />
could roll, causing a serious accident. Someone<br />
could be hurt or killed. Never rely on the<br />
service brakes to hold a parked vehicle.<br />
• Never drive your vehicle with the parking<br />
brake applied. Always release the parking<br />
brakes prior to moving the vehicle. Failure to<br />
disengage the parking brakes prior to moving<br />
your vehicle could result in excessive<br />
heat build-up in the brake system, resulting<br />
in a fire.<br />
NOTE: Today’s diesel electronic engines have significant<br />
torque and startability power at low RPM.<br />
Combinations of engine speed and available torque<br />
may over-power the vehicle’s parking brakes.<br />
To apply all your parking brakes, pull the yellow knob<br />
Out. The parking brakes will set. And the trailer air supply<br />
valve (red octagon knob) will automatically pop out, releasing<br />
air pressure and setting the trailer brakes.<br />
CAUTION: Do not try to put the vehicle in motion<br />
before pressure in the system reaches 100 psi<br />
(689 kPa) because the wheels are locked by the<br />
spring brake action. Unnecessary stress and<br />
possible brake malfunction could occur if the<br />
vehicle is forced to move before the air system<br />
reaches 100 psi (689 kPa).<br />
To release your truck or tractor brakes ONLY, push in<br />
the yellow knob. Your trailer will remain parked.<br />
• To release the trailer brakes ONLY, push in the red<br />
knob. The truck or tractor will remain parked.<br />
– 94 – Y53-6015 R(08/<strong>07</strong>)
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