Using the Promax BL - 47 brake lever is easy. Just place your four fingers on the padded rubber lever and squeeze. This will pull the two brake cables at the same time, helping your bike stop safely. Remember, this lever is designed for left - hand use and works with linear pull brakes. When using it, make sure your hands are dry for better grip. As for maintenance, regularly check the cables for any signs of wear or damage. You can clean the lever with a damp cloth to keep it looking good. If you notice any issues with the braking performance, it might be time to replace the cables or have a professional take a look.