Using this StopTech rear brake kit is straightforward. First, make sure your car is the 2003 - 2005 Subaru WRX model. If your car was made between 10/02 - 12/02, double - check the pad shape with the online photos. Then, replace your old brake pads, rotors, and brake lines with the components included in the kit. When driving, you'll notice improved pedal feel and shorter stopping distances. Remember, this kit produces a high level of dust, so you might need to clean your wheels more often. Also, although it's suitable for high - performance street driving and light track use, avoid using it in extreme racing conditions. For maintenance, regularly check the brake lines for any signs of damage or swelling. If you notice any issues with the braking performance, have it inspected by a professional mechanic right away.