The average cost of repairing a broken brake line can be $200 or $300 per axle, with the overall cost ranging from $400 to $700. Automotive brakes are just as important as any other part of your vehicle. It is imperative to keep up with routine maintenance on your brake system. This will ensure your vehicle remains safe for you and your family. Fortunately, most insurance policies cover the repair, but it depends on your specific plan and deductible.