Best and easy way.. use a pressure brake bleeder.
http://www.ebay.co.uk/itm/Gunson-Ez...136120?hash=item3a9859f7b8:g:qHYAAOxyXDhScojU
It's a can/bottle with brake fluid.. that gets screw onto of the mater cylinder.
It gets connected to a
pressure regulated air supply; a small amount of pressure is needed.. like ~0.3 bar.
Then the bleed nipples are unscrewed.. and the small pressure forces fluid through the pump, the abs unit, the lines, then the caliper.. and out.
If the pressure is to high the reservoir on the brake pump can jump off, or even crack.
Another system is the
vacuum system
It just connects to the bleed nipple... loosen it .. and pull a little vacuum.. the fluid will be pulled through the system. No chance of cracking the fluid reservoir or having it jump off the pump.... but you can get false air in the line (air can sometimes let in the bleed nipple not from the caliper.. but through the threads of the nipple).
In some cases it it necessary to use the appropriate interface to start the ABS pump while bleeding to get some of the air from the pump (it's almost never the case.. but i did have to do it when i replaced my brake pump)
This systems are a lot safer that classic bleeding, because the in the brake pump there will always be a part of the cylinder that is never used in normal operation ( towards the bottom of the pump), that part will sometimes be not as smooth as the regularly used part.. and sometimes even have a bit of rust. When bleeding, pumping..pressing the piston through hat part of the cylinder, the seals on the pump's piston can get damaged ... leading to either air getting in the pump..leaks.. or even the pump slowly loosing pressure when brakes are applied.
I did have one brake pump fail this way (probably because of classical bleeding... when somebody pumps the brakes and somebody else loosens the bleeding nipple).... when I would press hard on the brake pedal it was ok; but when i pressed slowly gently the pedal would slowly go to the floor. In my case i did not have any air in the system.