VWTypeITirePressure
When inspecting the tires, first check the tread wear. If the tread wear indicators are visible, the tires should be replaced. Irregularities in the tread pattern (cupping, flat spots, more wear on one side) are indications of front end alignment or balance problems.
Also check the tread area for cuts and punctures. Many times a nail or tack will embed itself in the tire tread, yet the tire will hold its air pressure for a short period of time. In most cases, a reair shop can repair the punctured tire.
It is also important to check both the inner and outer sidewalls of the tire. Check for deteriorated rubber, cuts and punctures. Also inspect the inner side of the tire for signs of brake fluid leakage, indicating that a thorough brake inspection is needed immediately.
Incorrect tire pressure cannot be determined merely by looking at the tire. This is especially true for radial tires. A tire pressure gauge must be used. If you do not already have a relaible gauge, it is a good idea to purchase one and keep it in the glove compartment. Built-in pressure gauges at gas stations are often unreliable. If you are in doubt as to the accuracy of your gauge, many repair shops have master pressure gauges which you can use for comparison.
Always check tire inflation when the tires are cold. Cold, in this case means the vehicle has not been driven more than one mile after sitting for three hours or more. It is normal for the pressure to increase four to eight pounds or more when the tires are hot.
Unscrew the valve cap protruding from the wheel or hubcap and press the gauge firmly onto the valve stem. Observe the reading on the gauge and check this figure against the recommended tire pressure listed on the tire placard inside the glove compartment or fastened to the driver's side door post.
Check all tires and add air as necessary to bring them up to the recommended pressure levels. Do not forget the spare tire. Be sure to reinstall the valve caps which will keep dirt and moisture out of the valve stem mechanism.