ok. here's some pics.
this one is from a 2002 chevy venture van. these lines are perfect.

the proportioning valves for the rear brakes...

these following are from a 96(i think) chevy surburban.
both of the lines in this picture are brake lines. there's one for each back wheel on this vehicle. the bottom one is in good shape. the one on top, look to the right of the bracket.......that is actually not too bad. look to the left of the bracket now, and follow to where it bends. see where it's rusted enough to be flaking off? that's bad.

this following picture is a little further back in the vehicle. again, note the rust flaking off. what you need to remember, is that that flaking rust used to be part of the brake line.

this next picture is just at the drivers footwell, just behind the front tire.

and this one here is a junction from the metal line to a rubber one to connect to the rear axle. this particular bend is a common failure point for these types of problems.

i really hope this stuff helps someone avoid what's happened to ranger.