In what condition should you check the air pressure of your tires?

Checking the air pressure of your tires when they are cold is important because tire pressure can increase as the tires heat up during driving. When tires are warm, the heat generated from friction can cause an increase in pressure, leading to a misleading reading. This can result in under-inflating or over-inflating your tires if you rely on those readings for maintenance decisions. Cold tires have better accuracy in reflecting the actual air pressure because they have not been affected by the heat of driving. This practice ensures optimal performance, safety, and fuel efficiency for your vehicle. Regular checks under cold conditions can also help in identifying any slow leaks or other issues that may arise.