If you have a broken tire valve, you will need to replace it. You can do this by following these steps:
1. Remove the wheel from the car. This will give you access to the valve stem.
2. Use a tire iron to remove the old valve stem from the wheel.
3. Insert the new valve stem into the wheel and screw it in place.
4. Inflate the tire to the proper pressure using a air compressor or hand pump.