brake fluid lead how to repair on 2003 Ford Taurus

the brake fluid is leaking when i fill brake fluid container the fluid all leaks out how do i repair and what are the costs?

Asked by for the 2003 Ford Taurus
Does the master cylinder reservoir leak, or is it loosing fluid by a leak somewhere else? Some master cylinders have replaceable reservoirs and others have to have the complete master cylinder replaced. If it's leaking elsewhere then you will need to diagnose where the leak is.