Hydraulic Brake upgrade for kit is an amazing upgrade for Pocket Bikes and other applications. This conversation is bolt on and will double your stopping power allowing you to drive that much more crazy! - Rear brake line measures 37" - Front line measures 22" Please select from the drop down if you want front, rear, or both. There is a picture of an MTA1 MTA2 pocket bike on our page just scroll through the pics to make sure this is what you need.