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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Overheated Brakes<br />
PART 7: STARTING & OPERATING THE VEHICLE<br />
<strong>Peterbilt</strong> tractors without anti-lock brake systems (ABS) are<br />
typically equipped with a bobtail brake proportioning system.<br />
When a trailer is not connected, the drive axle brake<br />
application pressure will automatically be limited by the proportioning<br />
system. When driven in a bobtail mode, these<br />
tractors will require greater brake pedal application to provide<br />
the equivalent braking to a bobtail tractor not equipped<br />
withaproportioningsystem.<br />
WARNING! Because of the increased use of the<br />
steer axle brakes when driving bobtail, always<br />
ensure the steer axle brakes are functioning<br />
and properly adjusted. Failure to do so can<br />
lead to decreased braking ability, longer stopping<br />
distances, loss of vehicle control, and can<br />
cause an accident.<br />
Brake Safety and Emergency<br />
To stop your vehicle in an emergency, vary the service<br />
brake application pressure to provide maximum braking<br />
force without locking the wheels. Use engine compression<br />
to assist the service brakes; i.e., don’t depress the clutch<br />
pedal until the engine reaches idle speed.<br />
WARNING!<br />
• Do not operate the vehicle in the event of a<br />
malfunction in any air circuit. The vehicle<br />
should not be operated until the system is<br />
repaired and both braking circuits, including<br />
all pneumatic and mechanical components,<br />
are working properly. Loss of system air<br />
can cause the service brakes not to function<br />
resulting in the sudden application of the<br />
spring brakes causing wheel lock-up, loss<br />
of control, or overtake by following vehicles.<br />
You could be in an accident and severely<br />
injured.<br />
• Unless you have an anti-lock braking system,<br />
always avoid completely depressing the<br />
service brake pedal, even during emergency<br />
braking. This action can cause the wheels to<br />
lock, which can lead to an uncontrolled skid<br />
and could cause an accident.<br />
Overheated Brakes<br />
Overheated brakes may be detected by a burning smell<br />
or smoke coming from a brake assembly. If this occurs,<br />
– 92 – Y53-6015 R(08/<strong>07</strong>)
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