I have a ML500 and am needing help on bleeding the brakes. I was told 2 different methods of bleeding.

1. Break open the bleeder valve on the caliper then Pump the brakes
or
2.Hold down the brakes then break the bleeder valve.

All I did to deserve this was change out the rotors and pads. Dont know how air got into the system. The system was never opened. Just the pistons pushed back via a c clamp.

Which method is the correct way to do it?