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How to Check
Use a good quality pocket-type gage to check tire
pressure. You cannot tell if your tires are properly
inflated simply by looking at them. Radial tires
may look properly inflated even when they are
under-inflated. Check the tire’s inflation pressure
when the tires are cold. Cold means your vehicle
has been sitting for at least three hours or driven
no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage firmly onto the valve to get a
pressure measurement. If the cold tire inflation
pressure matches the recommended pressure on
the Tire and Loading Information label, no further
adjustment is necessary. If the inflation pressure is
low, add air until you reach the recommended
amount.
If you overfill the tire, release air by pushing on
the metal stem in the center of the tire valve.
Re-check the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Professional Vehicle
The proper inflation of the tires on your professional
vehicle depends on the type of tires on it.
• If your vehicle has P235/60R17 size tires, the
cold inflation pressure is 41 psi (284 kPa).
• If your vehicle has LT235/60R17E size tires, the
cold inflation pressure depends on the vehicle
mass and should be determined by the vehicle
coach-builder. A Tire and Loading Information
label provided by the final stage manufacturer
should be attached to the B-pillar on the
driver’s side of the vehicle. If the final stage
manufacturer’s label is not present, the
coach-builder should be consulted. Do not use
the tire pressures indicated on the General
Motors label. These tire pressures are for the
incomplete vehicle and are not the correct tire
pressures for the completed professional
vehicle.
Operation at inflation pressures below this
recommendation may cause your tires to become
overloaded.
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