If it has a mechanical brake light switch it is located somewhere on the brake pedal. Normally around the area where the pedal connects under the dash. If it has a pressure switch, it will be located somewhere on brake lines near the master cylinder.
You can not use rubber fuel lines to replace the current brake lines due to the high operating pressure. You will need to replace them with brake lines, the rubber brake lines has a different construction to hold the pressure and not getting eaten away by the brake fluid, brake lines can hold over 2000psi when the pedal is heavily applied
Master cylinder brake lines are the most common brake lines on a the Chevy Malibu.
You remove the wheels to replace brake lines.
The brake lines can be replaced by removing all of the retaining clips. The brake lines will need to be disconnected on both ends. Reverse the process to install the new brake lines.
Brake lines run from the master brake cylinder to each wheel, generally under the frame of the car.
beside the brake booster on the firewall, under the AC lines (if equipped)
under the air filter box and battery platform front driver side
Pep Boys is a good place to go for brake system repairs. Look in the Yellow pages for your local listings of brake repair specialists. If Midas is located near you, they are another well known brake repair shop.
The brake lines are not attached to the booster. They are attached to the master cylinder. To remove them, use an opened end wrench on the fittings located where the lines meet the master cylinder and slowly turn counter clockwise. BE CAREFUL NOT TO STRIP THE FITTINGS THEY ARE MADE OF BRASS AND ARE VERY SOFT!
Why would you want to replace all the brake lines? You can flush the entire system and install fresh DOT3 brake fluid. I can see no reason to replace all the brake lines. Why are you doing this? Unless your brake lines are rotted out or someone has cut them... there is no reason to replace all four lines.
How to change brake lines on a 1991 Buick Lesabre?