PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —127— 22-01691 (R02/02)
Brake Adjustment
To operate your vehicle safely and profitably, you need some under-
standing of its brake systems. For more on brakes, see the Index,
under Brakes.
Brake adjustment and brake balance must be set carefully to (1)
make the most efficient use of the forces available for braking and (2)
allow equal stopping forces at all wheels.
Once a brake system is set to specifications, changing any one of its
components or any combination of components may cause the sys-
tem to not work as well. All parts have to work together to perform as
they should. Any replacement components in your brake system
should be exactly equal to the original components. Any changes
from the original specifications can affect the whole system. All of the
following areas are interrelated and must conform to original specifi-
cations:
•Tire Size •Brake Linings
•Cam Radius •Brake Chambers
•Wedge Angle •Slack Adjusters
•Drum Radius
WARNING! It is dangerous to work on a vehicle without
the right know-how and proper tools. You could be
badly injured, and you could damage the vehicle. Do
only work you know you are fully capable of doing, and
for which you have the right tools.
WARNING! To prevent uncontrolled vehicle movement and
reduce risk of personal injury, park the vehicle on a hard
level surface, apply the parking brake, and chock all
wheels securely.
CAUTION: The air brake system of this vehicle was con-
figured for ONE
of the following operations: tractor or
truck, and complies with the respective portions of
FMVSS 121. A tractor shall not be operated or config-
ured as a truck, nor shall a truck be operated or config-
ured as a tractor, without significant modifications to
the air brake system in order to retain compliance with
FMVSS 121.
Contact your Peterbilt dealer for instructions.
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