How to Replace Leaking Brake Lines

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What You'll Need
Metric line wrenches
Standard line wrenches
Rust remover
Metric wrenches
Vise grips
Medium size open end wrench
Drip pan
Floor jack
Jack stands
Tube bending tool
2 cans of brake fluid

Broken brake lines are an accident waiting to happen. Once brake lines lose pressure you will not be able to slow down in time to avoid catastrophe. Leaking brake lines are common in cars in areas with snow and ice. This is because of the salt used on the roads as it causes brake lines to decay. The best thing you can do to repair leaking brake lines is to replace them. It's a fairly straightforward auto repair you can DIY.

Step 1 - Assess the Problem

In order to discern the extent of the leaking brake lines, you need to have the vehicle supported. Raise the vehicle and place it on jack stands. From this perspective, you will be able to locate the brake lines. The master cylinder is a good starting point and then work toward the back. Look for rust and leaking hoses.

Step 2 - Remove the Brake Lines

In some circumstances, you may need to remove the entire system. Rust tends to be a factor when dealing with the bolts 
holding the brake lines in place. Spray the bolts with a generous amount of rust remover. After several minutes, remove
the bolts.

Step 3 - Replace the Brake Lines

Repairing brake lines is not approved practice, but rather replace entire length of leaking line for a safe and approved repair method.

Step 4 - Empty Brake Fluid

Fill master cylinder with brake fluid and then bleed the air from the brake lines. Place the drip pan below the brake bleeder in the rear and loosen it until brake fluid drips steadily from the line and then tighten it. Repeat the process with the left rear, right front, and the left front bleeders. Fill the master cylinder with brake fluid once more. Start the vehicle and pump the brakes slowly. Make sure you pause each time the brake touches the floor and it's released. Continue until there is good pressure. Shut the car off and inspect it for leaks prior to lowering the vehicle.