Brake Master Cylinder problems of the 2012 Chevrolet Suburban

2012 ltz 4wd Suburban, noticed a faint hot smell, thought it was the engine, took it in for an oil change on new years eve 2018 ( we had lost an engine in previous Suburban not taking chance) told by mechanic alloy wheels are hot, took to gm dealer, front wheel hub needed replaced, took to local garage for repair, garage told us brakes, caliphers, rotors be replaced due to caliphers being closed. They had hard time bleeding the lines, also replaced master cylinder, drove for few days short distance when front brakes caught fire, without warning, towed back to garage, they could not find cause, replaced brakes and rotors, drove for a week happened again, towed back to garage, they took to gm garage who replaced brake sensor, drove for few days locked up again kids in car, had towed to another gm dealer, told brake system tested normal to replace abs computer module, drove 2 weeks locked up again with kids in car, towed back to gm dealer, we were told by gm it was at risk of loss of life or catastrophic injury and they were sending tech, till we did not put gm brake pads, possible replacement of brake system could fix but not guaranteed. Gm dealer had Suburban 2/19-9/9/19 and it still is locking up without defined cause. I have been without vehicle this whole time & still owe on the vehicle. It was taken back to chevy dealer 10/26/19 after locking up again. There are no warning lights, the brakes lock up. There have been 2 major gm recalls regarding 2014+ Suburbans my issues are very similar regarding the braking system and even more severe. Had we been on busier roads we would have had an accident. We went to gm corp. / gm dealer lied to gm corp. We have vms to prove. Over $3k put into the vehicle and it still is not fixed, the brake system is $4k & that has not been proven to be the diagnosis. Vehicle not drivable. Pics from 1/27/19 incident, fire / smoke visable,.