Black plate (59,1)Cadillac STS Owner Manual - 2011When to CheckCheck your tires once a month or more. Do notforget to check the compact spare tire, if yourvehicle has one. The compact spare should beat 60 psi (420 kPa). For additional informationregarding the compact spare tire, see CompactSpare Tire on page 6‑105.How to CheckUse a good quality pocket-type gauge to checktire pressure. You cannot tell if your tires areproperly inflated simply by looking at them. Radialtires may look properly inflated even when theyare underinflated. Check the tire's inflationpressure when the tires are cold. Cold meansyour vehicle has been sitting for at least threehours or driven no more than 1 mile (1.6 km).Remove the valve cap from the tire valve stem.Press the tire gauge firmly onto the valve to get apressure measurement. If the cold tire inflationpressure matches the recommended pressure onthe Tire and Loading Information label, no furtheradjustment is necessary. If the inflation pressureis low, add air until you reach the recommendedamount.If you overfill the tire, release air by pushing onthe metal stem in the center of the tire valve.Re‐check the tire pressure with the tire gauge.Be sure to put the valve caps back on the valvestems. They help prevent leaks by keeping out dirtand moisture.6-59
