operators_manual

• Disassemble compressor and
thoroughly clean and inspect all
parts. Repair or replace all worn or
damaged parts, or replace
compressor with a factory
exchange unit.
Brake System
To learn more about brakes, see the Index,
under Brakes.
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 damage to the vehicle, serious
personal injury, or death.
CAUTION
The air brake system of this vehicle
was configured for ONE of the follow-
ing 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 operated or configured
as a tractor, without significant modifi-
cations to the air brake system in order
to retain compliance with FMVSS 121.
Contact your dealer for instructions.
WARNING
DO NOT use brake linings with a thick-
ness below the specified minimum.
Such linings will have lining rivets ex-
posed that can damage the brake
drum and reduce brake efficiency,
which could cause death, personal in-
jury or system failure.
WARNING
DO NOT use any replacement part in
the brake system unless it conforms
exactly to original specifications. A
nonconforming part in your vehicle's
brake system could cause a malfunc-
tion resulting in an accident causing
death or personal injury. Sizes and
types are so related to one another
that a seemingly unimportant change
in one may result in a change in how
well the brakes work for you on the
road. If parts do not work together
properly, you could lose control of your
vehicle, which could cause a serious
accident.
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 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
• Cam radius
• Wedge angle
MAINTENANCE - Brake System
Y53-6126-1A1 (01/21) 239
5