Check for missing upper control arm bolts.I have a 2004 envoy I was having a issue when I brake moderately hard there's a pop or thud sound from I think feels like the front right and jolts the wheel and the steering gets loose and sloppy like and truck will pull to the left.
I had sum play in front so I replaced the inner and outer tie rods check ball joints everything is tight and good but I have power steering leaking out the boot of the rack and Pinon can a bad rack be the problem I'm having with the steering when I brake hard?