Hey Scotty I'm working on a 2007 Pontiac grand prix changed the brake pads and went to bleed everything all of them bleed except the master cylinder so I took it out to bench bleed it I pushed all the air out of the master cylinder till it was all fluid so I put it back re bleed every Caliber and still the master wouldnt bleed its spit out a little fluid but not a full flow of fluid any ideas?