An easy-to-use repair kit or removing the tire from the rim and patching it comes first. First, connect an air pump to the tire's valve stem when it's time to use the tire. Then, verify your car's tires' PSI one more time. The proper PSI will be shown inside the driver's side door. Most manufacturers advise between 32 and 35 PSI. Make sure the tire is holding the air by pumping it up. As you fill the tire, check the air pressure and make adjustments.