How Much is the Average Cost of Brake Line Repair. Brake line repair can range anywhere from $15-20 (cost of the parts plus your time) to upwards of $400 at a dealership.The large fluctuation in price is largely due to the type of brake lines your vehicle has. Metal brake lines cannot be cut, removing the area that is failing, and reattached.Instead they must be completely removed and replaced. In addition, flexible brake lines tend to be cheaper. Average costs is $25 for parts and 1-2 hours of standard labor.etal brake lines cannot be cut, removing the area that is failing, and reattached. Instead they must be completely removed and replaced. In addition, flexible brake lines tend to be cheaper. Average costs is $25 for parts and 1-2 hours of standard labor.