Brake Master Cylinder problems of the 2017 Chevrolet Silverado

Same issue as current recall on 1500 series trucks but not on the 2500 series (which mine is). Pedal now very spongy, have to pump them to get adequate braking. This occurs at highway speeds and local driving. Panic stops require engaging the parking brake to prevent a crash. Have had it in twice for service but all they are trying to do is reprogram. There are other issues with the vacumn pump, hydroboost, master cylinder which they are apparently unwilling to address. Why the 2500 and 3500 trucks were not included in the recall is the question of the day. I am not driving the truck any more than necessary as it is unsafe. This complaint is a matter of record of the issue.