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.
Also question is, how much would it cost to replace a brake hose?
The average cost for a brake hose replacement is between $144 and $193. Labor costs are estimated between $105 and $134 while parts are priced between $39 and $59. Estimate does not include taxes and fees.
What would cause a brake line to break?
Rust contaminates the fluid and can cause tearing of rubber seals in the brake master cylinder or in the calipers. On rubber hoses, the rubber slowly begins to deteriorate due to moisture and heat. Once a line breaks, there is no more pressure in the brake system which can cause the brakes to completely fail.