Difficulty Bleeding 1940 Brakes

[tubman]

DOT-5 fluid is on the way out. It does not work well with anti-lock brakes, which are becoming more and more common, so it will become increasingly difficult to source. Also, as you stated, it can be hard to bleed. I had it in my '68 Corvette. It was very difficult to bleed, but once I got it in, it was great. That being said, it was the last time I used it. I now flush and change the fluid in my cars brake systems every 10-15 years with no problems. Speed-Bleeders make this an easy process.