I found a method for burping (get the air out of the circuit) hydraulic disc brakes in YouTube (see here). The method is:
1) Rotate/move the hand lever assembly until the reservoir cap is facing up and at level.
2) Take off the reservoir cap.
3) Slowly squeeze the lever repeatedly, until no more air bubbles come off.
4) Refill the reservoir with brake fluid.
5) Put the cap back on and return the lever assembly to his normal position.
To me it looks far more simpler than the standard procedure, and can be used in an emergency on the road (Obviously, it doesn't apply for replacing old fluid).
What problems can you see with this method?