Depends on where it is leaking, and gaining access to the line. Shouldn't cost much more than about $200.00, including the parts, and bleeding the brake system.
If one is leaking and you replace it you'll be back in the shop (or in a ditch) in a month. Somehow or another Ford has manufactured those brake lines to all go bad at once. They've been perfecting that since 1967...You can probably get all your lines replaced for less than $500. Specify that you want coated or stainless steel lines if you plan to keep the car.
A brake repair for a 2004 Ford Mustang costs about $1500.
Replace the leaking part
Depends on what the person is charging in for lol
You have a serious brake problem. For your own safety have the vehicle towed to the garage of your choice for repair.
There is no safe way to repair a broken or leaking brake line. The line or tubing that is leaking must be replaced or a new piece of tube, spliced into the line with fittings, to replace the leaking area.
It is important to replace a brake line at the first sign of leaking. A brake line is a fairly simple repair, first you must remove the old line using two wrenches on the hex bolts. Then you screw the new brake line in place using the wrenches and replace fluid.
You must remove it, fit a new one and then bleed the brakes to remove the air in the new line.
D O T ( 3 ) brake fluid
When a brake line is leaking on the Chevy Venture the brake line should be replaced as soon as possible. A leak, however small, can cause hydraulic fluid to escape the brake line which will cause a loss in brake pressure. The brakes should be bled of air after the new line is put in to remove gaps in brake pedal pressure.
There are several sources that offer brake repair service by a brake team, you should choose one that offer the least stress on you as they do the repair. Two names come to mind and they are Mienke Brake Repair Service and GMC Brake Service and their work is excellent.
Seal in brake caliper is leaking and needs replacement Flexible brake line to the caliper is leaking and needs replacement
brake fluid leaking from a brake drum indicates the brake slave cylander on that wheel is leaking and needs to be replaced you will not see the actual leak with out removing the brake drum