Howdy all, first time yukon owner and poster. I picked up a 1999 Yukon slt 4x4 5.7 last week and decided to dive into the brakes today. Right off rip I ran into a few problems. My rear passenger brake bleeder was clogged so i replaced it. Next we tried to bleed the brakes and as soon as my 13 year old touched the brake, fluid started shooting out of the master cylinder. purchased new master cylinder, bench bled it and still doing this. Anyone had this issued before? I have traced all lines and cant find any leaks or punctures