More urban legends dispelledSteel braided brake lines will not reduce stopping distances. Some claim a firmer pedal feel but that too is difficult to swallow. To be DOT approved the line must be teflon or rubber inside the braided jacket. Those materials compress/expand as much as the stock rubber coated lines on the truck. If your stock rubber lines are soft enough to make the pedal not as firm as it should be, new lines are in order. Fortunately they are made to pretty strict standards and unless the truck is close to ten years old I suspect they are still in good shape. You may be able to find a set of brake pads that will stop shorter but the braided steel lines are no more than decoration.
im gonna disagree with you here i had the braided lines on and when i installed them felt a huge difference in the pedal feel it was much firmer. recently someone cut my brake lines and because i needed the truck i went to a brand new factory line and its very soft. like stepping on a balloon. your right the lines have to have rubber or teflon on the inside but thats a thin liner and therefore doesnt compress much.
i do agree that it doesnt stop you any faster however something to consider is that the with the firmer pedal from the lines that it applies more pressure to the pads and stops you faster that way. i say this because with my new factory lines im taking longer to stop due to the change in the pedal and my muscle memory not adjusting for that.