I started fabricating the rear brake line that transitions from the left 4″ chassis tube up to the tee on the left side of the chassis. If I use this piece, I’ll need to install a separate straight section from here forward to the other piece I installed here. I have a long enough piece of tubing remaining that I could make a single piece that runs from the tee forward to the other piece. It would let me avoid an extra union in the line which would reduce the chance of leaks, but it would be trickier to make a piece that long.
The tube still needs to be bent to run back along the rectangular tubing and then over to the tee near the bottom of the picture.