I need to bleed the brakes on a 98 3500 truck that has the power steering hydraulic power assist but the pump pump pump hold method isnt working too good. the pedal is still soft.

Will the pump pump pump hold method work on this vehicle? it has some funky module that I believe to be the antilock brakes on it (the module sits on the inner fenderwall, has brake lines going in an out, 3-4 electrical connectors and a black top that says Kelsey Hayes).

Will the pump pump pump hold method work? several lines were busted and the entire master cylinder/power assist unit was replaced (from a junk yard donor truck) so I expect there is a lot of air in the lines.

and I did bleed the master cylinder first. I also tried a mityvac setup and found LOTS of bubbles in the front lines.

probably not if the power master(abs) has air in it there is a automated bleed procedure that requires a scan tool to preform I am not aware of any short cuts for this I have had many trucks come in with spongy pedal and all I had to do is hook tech2 up and preform the automated bleed to get good pedal you still ahve to do a manual bleed but normally won't get good pedal till automated bleed is done

Dont do the pump, pump, pump hold, just do the pump hold.
Maybe the junkyard part is bad?

i thought about that master cylinder being bad too.