How do the valves open? That's the question. If you have no electrical control over opening individual valves how are you doing it? Are you talking about opening the brake line?Yes, this is true---if you dont have a scan tool----There is a shade tree trick around this----a gravity bleed---meaning no pressure applied during bleeding. One valve open at a time; for about 10 minutes. Valve closed, next one open. Starting with the closest valve to the ABS module (backwards from standard)....---that being said, a standard bleed has to be done first to get the majority of the air out of you'll be there all day.
I've done it many times, works great, just takes a while, but if you dont have a scanner to activate the ABS module;