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It is very dangerous if brake lines on a car stop working. Under no circumstances should anyone drive a car with a broken brake line, not even if it is the back brakes versus the front brakes. If you need to replace the brake line soon, the person checking your brakes will say so. How do you know if your brake line is not working correctly? Braking will take much longer than usual, and require putting your foot down hard on the brake peddle, which can potentially be a very dangerous situation. A car repair shop that specializes in brakes is the best place to get your brakes checked.