It must be me but I have had a lot of trouble with using the brake pedal to bleed brakes. As pointed out, it is too easy to push the piston too far. Also, you run the risk of setting off the brake failure switch. It works on brake imbalance and since the switch is rarely activated, it is prone to stick once it trips. I now use the pressure bleeder sold by ipd. It's a plastic bottle you fill with brake fluid, attach to the master cylinder and hook up to a spare tire for air pressure. If you can get the car up with all 4 wheels off, you can bleed the system in 15 minutes or less as you walk from wheel to wheel. Heed the caution on pressure. A full 30 pounds of air pressure is too much. Bleed off the spare to about 20 pounds. An added feature is that if you need to purge the system of really contaminated fluid, don't fill the bottle until you have blown out the old stuff. Oh yeah, this system allows you to do the job without help.

Skip
'93 850GLT
'89 765T
'83 242TI Flathood