Using these StopTech brake pads is easy. Just install them on your 2015 - 2021 Subaru WRX's front brakes as you would with regular brake pads. When driving, you'll notice improved stopping right away. For cold weather, they'll start working well as soon as you start moving. In hot weather, they keep their performance. As for maintenance, check the brake pads regularly for wear. If you see they're getting thin, it's time to replace them. Also, keep the shims clean to ensure they continue to provide a noiseless operation. That's all you need to do to enjoy a great driving experience with these brake pads.