depends on how many lines you are replacing?
at autozone they sell it by 8", 12", 20", 30", 40", 50", 60", then a 25' roll.
then there 4 different sizes like 3/16, 1/4, 1/8, 5/16.
for prices you can go to there website or stop in and ask. But for fitings for the master cylinder your on your own.
Hope this helps.
Take the cover off in the trunk and turn the bulb socket to the left.
Before repairing the brake lines the brake fluid must be drained. The car should be safely lifted and supported. With the wheels off unbolt the line from the caliper to the hardline. Replace the line.
Measure each brake line and go to the parts house and get the necessary lines. You will need a tubing bender. Remove the old lines one at a time and bend as needed. install the lines and then fill the master cylinder and bleed each wheel.
For the car with such age it can be anything. I would start from main brake lines. If the lines are fine, check calipers and rear brake cylinders for leaks. If you find any leak it's easier to replace a part, then trying to fix it.
You have air in your brake lines. Have the brakes bled.
Check the bulbs, check the fuse, check the brake light switch, in that order.
You ought to be able to get at them from inside the truck.
how to change the brakes
You will need to use the universal brake lines sold at auto stores. You can check at a Chrysler dealer but I think they are discontinued there.
If you have a leak you can replace just the rusted section of the brake line. Any auto parts store will have what you need to do so. Ensure person performing repair performs the job properly.
change the wheel cylinders or the brake lines
junkyard.