Car Tires

How do I put air in my car tires without damaging it?

I mean seriously I never put air in my old car because I, and I've had for a year. never checked the pressure and everything. So then I go to the service station and fill it up? I think that little thingy unscrew some how to adapt the machine to give the air in the hole. and perhaps press a button or something. I have never seen the atmosphere of machine before. But the question is. How do I know when I stop? How do I know when it is full. How do I know if I am not over ... When I fill helium balloons i just wait until he stops by itself, when everything is full to the max. Can I do with the tires? Teach me please. Dad taught me to hunt, make love, but he was not there to teach me about cars.

The first thing is to buy a pressure gauge for tires. Do not count on them in gas stations for public use. CAP Unscrew and remove. Press the gauge on the valve stem and push down until the air does not flee. Next, look at the reading on the gauge. If the tire is low, then press the air nozzle down on the stem and push the button filler. Do this for about 3 seconds. Then repeat the process, it will give you an idea of how fast the tire is filled and the time it takes to get pressure increase a kilogram of air. Each time you arrive at the correct pressure, replace the cap and you're done. good luck.