How to check that your tires are inflated correctly:
1. Check the tire pressure. In all four tires. Check your tire's pressure at least once a month, especially before traveling long distance or out of town. It is important to do so because tires with insufficient pressure will cause the tire to heat up and wear them much quicker. It also directly affects handling and can make it dangerous to drive!
2. Be sure to check the correct front and rear pressure of your tires. Sometimes the front and rear tires should be inflated to different pressures. The correct tire pressure for the front and rear tires can be seen on the sticker attached to the inside of the door of your vehicle, or the vehicle owner's manual.
3. Always check tires pressure when they are “cold.” This just means to check the tire pressure when the car hasn’t been driven recently, preferably not for at least 3 hours.
4 . Unscrew the valve stem cap from the valve stem on the tire. The valve stem is a black pencil-sized extension near the hubcap, about 1" (2-3 cm)
5. Press the air pressure gauge onto the valve stem and record the reading given. Pay attention to if there is a hissing sound. If so, the gauge is not tight enough for an accurate reading.
6. Check that if the reading is the same as the manual's specifications
a. If the pressures are the same as in the manual, you are done after checking all the tires for the correct pressure.
b. If the gauge shows that pressure is in any of the tires is low, then add air to the tires. Make sure you put in the correct amount, do not overfill.
7. Make sure to replace the valve cap on the tire valves. Driving the car for extended periods without a tire valve cover can result of excessive air leakage from inside the tire, resulting in a loss of tire pressure. The cap does not actually hold air in, but it keeps dirt and moisture away from the valve mechanism in the valve stem, which does hold air in.
8. Don't overload your car. Check the maximum weight that your car can safely handle. If you regularly overload the vehicle, this can cause excessive pressure on your tires, change the handling, and can create unsafe driving conditions.