A very inexpensive way to make a homemade power bleeder is to use a schrader valve in an extra brake reservoir cap. Drill the appropriate size hole in the cap. I believe it is 9/16", and the easiest way to drill it is probably going to be a step drill. Pull the valve into place. You will need to retain the gasket in some way.

Install the cap on a full resevoir of fluid and attach a frame mount bicycle pump to the valve. Open the valves one at a time in the correct sequence. Expel the fluid through the open bleeder by giving the pump a couple of strokes. Close the valve with fluid still in the process of leaving the bleeder.

Stop occasionally to refill the reservoir and do not let it run out of fluid. Using a power bleeder does not put your master cylinder at risk like it is when you use it to create the pressure to bleed the system.

Randy