If you hit the brakes and it seems like the car isn't stopping with the force that it used to, then it's time to think about tire replacement. Exposure to the sun if enough to warp tire sidewalls causing cuts and cracks in the rubber material.
Ultraviolet rays have been shown to alter the structural integrity of the tire. This is more so the case in colder climates, but still applies in moderate regions to a certain extent. It's important to remember that tread quality is all about safety. Without fresh tread, imbalances are introduced into the system, which is dangerous during and after heavy precipitation. Better tread helps the car grip the road even when conditions aren't suitable for easy travel. Regardless of the tire brand, most of them need to be replaced after 6-10 seasons.
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