If you’re doing brake lines a double flare is an absolute necessity. A single flare could be dangerous. Luckily The double flare kits are not that expensive, they’re under $20 typically. In the video I go through the details on how to clamp and work on re-creating a double flare so you can properly put your brakes back together. There is a difference in the kids there are special dies that must be in the kit in order to do the double flare. Without these special dies you can only do a single flare. Steel brake lines are more difficult to make this flare then the copper nickel brake lines. Copper nickel brake lines are more expensive but are much easier to work with and will never rust away. If you’re going to be put in the time and consider the nickel copper brake Lines