Using these Faction Fab brake lines is easy. First, make sure your vehicle is safely parked and the engine is off. Locate the rear brake line connection points on your Subaru WRX (2008 - 2021). Carefully remove the old rubber brake lines and replace them with the new stainless - steel ones. Ensure that all fittings are tightened properly. When driving, you'll notice improved braking right away. For maintenance, regularly check the lines for any signs of damage such as cuts or abrasions. If you see any issues, replace the line immediately. Keep the lines clean to prevent debris from causing damage. Also, remember to check the brake fluid level regularly as these new lines may affect the fluid distribution slightly. Don't forget to have your braking system inspected by a professional periodically to ensure everything is in top - notch condition.