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Air Pressure and Air Pressure
Monitoring System
The most important factor in maximizing the
life of your tires is maintaining proper inflation.
Driving on a tire that does not have the correct
inflation pressure for the load of the vehicle is
dangerous and may cause premature wear, tire
damage, and/or loss of control of the vehicle.
A tire that is underinflated will build up excessive
heat that may go beyond the prescribed limits
of endurance of the rubber and the radial cords.
This could result in sudden tire failure. A tire that
is underinflated could also cause poor vehicle
handling, rapid and/or irregular tire wear, or an
increase in rolling resistance which results in a
decrease in its fuel economy.
Over inflation will reduce the tire’s footprint
or contact patch with the road, thus reducing
the traction, braking capacity, and handling of
the vehicle. A tire that is overinflated for the
load that it is carrying will also contribute to a
harsh ride, uneven tire wear, and will be more
susceptible to impact damage.
Maintaining correct tire inflation pressure for
each loaded wheel position on your vehicle is
of the utmost importance and must be a part of
regular vehicle maintenance.
Federal law requires that the tire’s maximum
load rating be molded into the sidewall of the
tire. If you look on your tire’s sidewall you’ll
see the maximum load allowed for the size
tire and load rating, and the minimum cold air
inflation pressure needed to carry that stated
maximum load. Utilizing less air pressure means
a lesser load can be carried by the tire. Another
method of determining the maximum tire
pressure is to review the Federal Certification
Tag. This tag is located on the interior side
wall by the driver’s seat. Other information
regarding tires and vehicle weights is also
included on this tag.
The amount of air pressure you need to use
depends on the weight of your fully-loaded vehicle.
So, you cannot determine your correct air pressure
unless you know your vehicle’s actual weights.
Your vehicle may be equipped with an on-board
“tire pressure monitoring” system. The individual
tire pressures are displayed on the monitor when the
feature is selected. This tire pressure air monitoring
system is to be used for “Reference Only”. To
accurately determine the individual tire pressure
a reliable and calibrated gage in good working
condition should be used. Consult your Fed
Certification Tag for proper tire inflation pressures.
Follow the guidelines in this owner’s manual for
checking air tire pressure. Consult your monitor
system’s owners manual for additional information.
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On The Road
NOTE
American Coach recommends using a high quality
tire pressure gauge for accurate, repeatable
pressure readings.
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NOTE
Check the wheel lug nut tightness periodically. They
could work loose during driving. Check the Chassis
Operator’s/Owner’s Guide/Manual for correct lug nut
torque and torquing procedure, and schedule.
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WARNING
For safety and maximum tire life, check and adjust
tire pressure (including the spare, if equipped) at the
beginning of each trip and daily during the trip. Pay
special attention to inside rear duals. Always check
pressure when tires are cold, and do not bleed air
out of warm tires. Follow the tire pressure instruc-
tions in the Chassis Operator’s/Owner’s Guide/
Manual or the tire manufacturer’s tire pressure chart.
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NOTE
The tire pressures on your motor home were adjust-
ed at the factory to the tire pressures specified on the
Federal certification tag.
These pressures are specified at full gross vehicle
weight and should be reset to match the weight of
your motor home.
For maximum performance, tire manufacturers pro-
vide tire inflation pressure charts so you can match
the tire pressures to the loads on your motor home.
For additional tire pressure information, consult the
Chassis Operator’s/Owner’s Guide/Manual.
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