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obtain the recommended tire pressure if your tires are not cold.)
Because tires are designed to be used on more than one type of vehicle,
tire manufacturers list the “maximum permissible ination pressure” on
the tire sidewall. This number is the greatest amount of air pressure that
should ever be put in the tire under normal driving conditions.
1.5.3. CHECKING TIRE PRESSURE
It is important to check your vehicle’s tire pressure at least once a month
for the following reasons:
• Most tires may naturally lose air over time.
• Tires can lose air suddenly if you drive over a pothole or other object
or if you strike the curb when parking.
• With radial tires, it is usually not possible to determine underination
by visual inspection.
For convenience, purchase a tire pressure gauge to keep in your vehicle.
Gauges can be purchased at tire dealerships, auto supply stores, and
other retail outlets.
The recommended tire ination pressure that vehicle manufacturers
provide reects the proper psi when a tire is cold. The term cold does
not relate to the outside temperature. Rather, a cold tire is one that has
not been driven on for at least three hours. When you drive, your tires
get warmer, causing the air pressure within them to increase. Therefore,
to get an accurate tire pressure reading, you must measure tire pressure
when the tires are cold or compensate for the extra pressure in warm tires.
1.5.4. STEPS FOR MAINTAINING PROPER TIRE PRESSURE
• Step 1: Locate the recommended tire pressure on the vehicle’s tire
information placard, certication label, or in the owner’s manual.
• Step 2: Record the tire pressure of all tires.
• Step 3: If the tire pressure is too high in any of the tires, slowly
release air by gently pressing on the tire valve stem with the edge of
your tire gauge until you get to the correct pressure.
• Step 4: If the tire pressure is too low, note the dierence between the
measured tire pressure and the correct tire pressure. These “miss-
ing” pounds of pressure are what you will need to add.
• Step 5: At a service station, add the missing pounds of air pressure
to each tire that is underinated.
• Step 6: Check all the tires to make sure they have the same air pres-
sure (except in cases in which the front and rear tires are supposed
to have dierent amounts of pressure).
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