2011 Cadillac DTS Owner's Manual - Page 360

How to Check Use a good quality pocket-type gauge 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 gauge 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 gauge. 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. 6-58