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You should check air pressure once a month, and before a long trip. Make sure that your full-sized or mini spare is properly inflated as well.
Always inflate your tires to the recommended pressure listed by your vehicle's manufacturer. This information can be found in the owner's manual and often on a placard located in the vehicle's door jamb, inside the fuel hatch or on the glove-compartment door.
Air expands when it's hot and contracts when it's cold. For accurate pressure, always check the pressure when the tires are cold – at least 3 hours after the vehicle has been stopped and before it has been driven 1 mile. It's best to inflate your tires in the morning before the day's heat.
The tire's valve is a very important maintenance item in terms of keeping the air in your tires. These valves are ordinarily rubber, can deteriorate over time and should be replaced when you buy new tires. At high speeds, a cracked, deteriorated rubber valve stem can bend from centrifugal force and allow air loss.
The valve cap is also an important item. Buy some good quality valve caps that can contain the air should the core of the valve fail for any reason. Valve caps also keep out moisture, which could freeze and depress the valve core, causing loss of air. The cap also keeps out dust and dirt particles, which could also interfere with the proper operation of the valve core and cause loss of air.