Thanks for your recording, it really helped me since I have not done this before. I was able to rebuild rear master cylinder, bleed front and rear brakes, rode for test, and all worked.
Clear instructions, good video and audio. Can I just make the point that scraping with a screw driver and using a wire brush should be avoided. Always use something much softer than those parts, such as a brass (wire) brush. O would have liked to see the front brake master cylinder, but I guess the principles are very similar. Thanks!