Bleeding brakes / master cylinder on hydroboost

So I am not an expert on brakes... With that said; I am having trouble with my own set up.  I have a hydro boost on my truck.  I bleed all four wheels but the pedal is still on the floor without and firmness.  Do I need to do something to the master cylinder?

Did you bleed the master cylinder? It needs to be bled first on the bench unless your talened and are able to do it on the truck. Then youll bleed each wheel starting with the wheel farthest away from the master.

The master is in the truck so bench bleeding is out of the question.. Can I do it in the truck?

Edited: 2/9/2010 8:29:10 AM by 1lowdiesel

sometimes with hydro boost trucks you will need to get a TechII scan tool and pulse the ABS to get the air out. i was having a problem bleeding mine a while back and read that in the GM book.