I have never had a car that came from the factory with stainless steel brake
lines and certainly never seen one with marine brass brake lines (and making
brake lines from brass would not be a good idea - too great a chance of
metal fatigue). Maybe some high end cars may have stainless brake lines, but
stainless is hard to work with when you have to make bends and is subject to
stress cracking. All of the brake lines I have actually touched are double
wall low carbon steel with a zinc coating to prevent corrosion (other
anti-corrosion coatings include  zinc - aluminum, or copper). This sort of
steel tubing is sometimes referred to as "Bundyweld" or "Bundy double wall"
tubing (see http://www.tiauto.com/bulktubing/double_wall.php ). Some
European cars (Volvo and Audi for sure) use "Cunifer Alloy" (90-10
copper-nickel alloy) for the brake lines, but I have never personally
touched one of these (see
http://www.copper.org/applications/automotive/pdf/a8001.pdf ).

Ed

I think your name should be OVERLY  OPTIMISTIC
considering your insane idea that Ford may want to pay
for repairs to a 12 year old truck.
Hopeful just doesn't do it.

PS I have never seen stainless or marine brass used in
auto brake lines.

SS/brass??  On what planet?  U have a Ford pick-up, not a Space Shuttle.

Dave S(Texas)

Most vehicles use plated steel for brake lines, not stainless.  And, it
can most certainly corrode.

Stainless costs too much for penny pinching detriot and they do not
want it to last to long anyway and brass is too soft for this. A
simlpe trick that I have used that works well is to spray the brake
lines with gear oil in a old paint spray gun every fall and spring. I
do not have "normal" failure of any metal brake lines. My 89 burbs
lines still look almost like new. Another thing, rust is a galvanitc
reaction of sorts with atmosphere and metal and when you rust proof
the car, anything that is not rust proofed tends to be atacked worse
because a difference of charge or potenail develops between car and
air aggravatted by salt and rust proofing focuses the "discharge" of
the potentail and the rust process that results to unprotected areas.
Back in the 50 they used to put anode lead bars on some cars to
control this process scientifically and that would sacrifice
themselves while saving vehicle. You will not see that today because
all that lead would not be environmental freindly. Also, brake fluid
is glycol based and atracts moisutre so it can be attacked from both
sides of pipe wall sometimes.  
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