Using the PERRIN brake reservoir cozy is a breeze. First, locate your vehicle's master cylinder reservoir. Then, take the cozy and gently stretch the foam ring over it. It should fit snugly. This whole process takes about 1 minute. When it comes to maintenance, there isn't much you need to do. Just check the cozy occasionally for any signs of wear or damage. If you notice any fluid buildup on the cozy, you can clean it with a mild soap and water solution. Make sure it's completely dry before putting it back on. Remember, this cozy comes with a 5 - year manufacturer warranty, so if you have any issues, reach out to the manufacturer. And always ensure that the vehicle is turned off and cooled down before you install or perform any maintenance on the cozy.