2015 prostar auto. braking issues

I have 4 2015 prostars automatic that have trouble braking. When trying to come to a stop the truck seems to keep going forward. Even with the brake pedal pressed the truck keeps leaching forward. I have gone as far as replacing the brakes along with brake valves and this continues. Could this be a transmission issue? Also at times the trash control light will come on. Could that be because of the airbags been over inflated as well?

 

What would be the best course of action? Would it be a transmission issue? Meaning I would need to get the automatic transmission serviced or replaced?

 

awesome. thanks for the help. going to check all this tomorrow.