Found out the hard way that you absolutely need this to install SRAM 'stealthamajigs'. Be generous; give the barb a good coating and put plenty on the little red guy and the 8mm nut threads. Tighten to 8 nm, which is a goodly amount of torque for something that small, and no tears. Skip one of these steps and you might not have a leak, but you'll be asking for one. That said you'd have to repair about 10,000 brake lines to ever use up the jar, assuming you never forgot to put it away properly and didn't pollute the whole batch. A little foil packet would make a lot more sense.
I needed to cut down the brake lines when I installed the new Sram Red group set, I wanted to use the factory tools, fluids and fittings so it was a no brainer to use the Sram DOT approved grease.
A little spendy for what it is but it works.
