How to bleed brakes alone
Before doing this, you need to slightly loosen the brake master cylinder or caliper nipple to allow some fluid to drain by gravity, then bleed as in the video. If you're completely bleeding the brakes, meaning you've replaced the master cylinder, then drain 250-300 grams of fluid from the rear right master cylinder by gravity to allow new fluid to flow, then bleed using the pedal. Make sure there's always fluid in the reservoir; if air leaks, you need to repeat the process.