Braided Stainless Brake Lines
When I purchased this RT the rubber brake lines were already almost twenty years old. There were no obvious signs of age such as cracking or leaks, but the brake lever was spongy, and even after flushing out the old fluid, wasn't as firm as it should be. Several kits are out there for replacement lines featuring teflon tubes covered by a stainless steel braid, which in turn is covered with a clear or colored plastic coating to prevent abrasion to adjacent components. They boiled down to two variations: The first kind were a one-to-one replacement for the BMW factory lines, and left the steel brake lines intact. The second kind used two identical lines that extended from the master cylinder on the handlebar to each caliper. I wasn't thrilled with the one-to-one kits as they left the hoop of steel brake line that connects the two wheel calipers intact. That hoop extends up and over the front wheel, then down to the calipers, and is infamous for trapping air when the brake system is opened. I didn't like the idea of a double long banjo bolt at the master cylinder either, but it was necessary if the second option of double brake line was used. I knew that "T" and "Y" hydraulic fittings were available, but was unable to find a kit that used one to provide the best option: A single line at the master cylinder going to a centrally mounted "T" and lines extending from there to each caliper. I'd been making brake lines for years, and figured it was just a matter of figuring out the proper fittings to make this one too.
After looking at the available options I settled on