When you do it. Put a clear plastic hose over the bleeder, and the other end into a bottle. When the fluid starts coming out. You can see the air bubbles in the fluid. Pump 3 times, hold down, open bleeder, keep pressure on pedal until it goes to the floor, close the bleeder. Repeat until the fluid has no bubbles in it. Keep an eye on the reservoir so that it does go dry.
You be surprise at the number of people who lift off the brake pedal before closing the bleeder.
If you do that. You're sucking air back in. And they wonder why they have problems bleeding.