Using this StopTech brake kit is straightforward. First, make sure to verify the pad fitment according to the build date as mentioned in the fitment notes. Once you've confirmed it fits your 2002 - 2003 Subaru WRX, you can start the installation process. Simply replace your old brake pads, rotors, and brake lines with the components included in the kit. For maintenance, regularly check the brake pads for wear. If you notice excessive noise or reduced braking performance, it might be time to replace the pads. Also, keep an eye on the brake fluid level and quality. If the fluid looks dirty or has a low level, it's a good idea to have it changed. When driving on the track or in high - performance situations, be aware that the brakes will work harder. Let the brakes cool down after intense use to prolong their lifespan. And always follow the standard safety procedures when working on your vehicle's brakes.