Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

Driving Tips And Techniques
WARNING! Your brakes could fail if you continue
driving with deflated air springs. Air escaping
from the system will lower the air pressure,
which could cause a spring brake to engage.
The spring brake may cause your brakes
to drag and burn up the linings. Don’t continue
to operate in this condition.
You can get to a repair facility if you do the following:
1. Remove the height control link connected to the axle
and to the suspension air valve control arm. This will
cause the air valve control arm to center in the closed
position.
2. The air system can then be pumped up to normal pressure
for continued operation.
WARNING! Low air pressure could make the
brakes unsafe for driving. Before driving the
PART 7: STARTING & OPERATING THE VEHICLE
vehicle, make sure the pressure does pump up
to over 100 psi for normal brake operation. If
the air pressure does not pump up to at least
100 psi, don’t try to move the vehicle.
CAUTION: Operating a vehicle with air suspension
bags either overinflated or underinflated
may cause damage to drivel ine components.
If a vehicle must be operated under such conditions,
do not exceed 5 mph.
Driving Tips And Techniques
This section covers additional driving tips and techniques
on how to drive your vehicle more efficiently. For further information,
read the American Trucking Association’s (ATA)
Truck Driver’s Handbook. Itwillgiveyoumoretipsonstarting,
shifting, and driving your vehicle.
– 104 – Y53-6015 R(08/07)