Peterbilt 325 2017, Operator'S Manual

Page: 273 / 392

BRAKE SYSTEM
BRAKE SYSTEM
Brake Adjustment
WARNING!
Do not work on the brake system
without the parking brake set and
wheels chocked securely.
If the
vehicle is not secured to prevent
uncontrolled vehicle movement, it
could roll and cause death, serious
personal injury or damage to the
vehicle.
To operate your vehicle safely
and profitably, you need some
understanding 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.
CAUTION
The air brake system of this vehicle
was configured for ONE of the fol-
lowing operations: tractor or truck,
and complies with the respective
portions of FMVSS 121. A tractor
shall not be operated or configured
as a truck, nor shall a truck be op-
erated or configured as a tractor,
without significant modifications to
the air brake system in order to re-
tain compliance with FMVSS 121.
Contact your dealer for instructions.
Once a brake system is set to
specifications, changing any one of
its components or any combination of
components may cause the system
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 specifications:
•
Tire Size
•
Drum brakes
a. Cam Radius
b. Wedge Angle
c. Drum Radius
d. Brake Linings
e. Brake Chambers
f. Slack Adjusters
•
Disc Brakes
a. Disc Rotors
(03/17) Y53-6060-1C1
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