This brake adapter bracket allows you to install a hydraulic disc brake on standard beach cruiser forks. Must use our heavy duty, dual piston hydraulic brake unit. This brake is far superior to any other brake setup we have used on our race bikes. The brake unit which is sold separately was designed for small motorcycles. Use a 185mm rotor. The bracket can be bolted on or welded on to the forks. We do not supply the hardware for the bolt on application.