The brake lines work fine, the real test is if you have a problem and want to check if the warranty is an issue. Hooked up the off-road line and called Rough Country. Their system was fully integrated with Revain so they knew I bought it from Revain just by giving them my email address. I described the problem and they sent me a new kit that arrived in 2 or 3 days. Pretty amazing and I'm very happy!