Using this hydraulic master cylinder is easy. First, make sure it's properly bolted to your 7/8' diameter handle bars. Fill it with either DOT 3 or DOT 4 fluid. When you activate the hand brake, it will start working right away. Remember to check the fluid level regularly. If it's low, add more fluid in time. Keep the master cylinder clean to avoid dirt getting in, which could affect its performance. If you notice any leaks or abnormal braking, have it checked by a professional.