so I had to try to see what happens..the truck comes to a stop. there is a message that displays in the cluster that reads "dynamic braking active", and it feels like the ABS pump applies all 4 brakes first, not super aggressive, but it does stop quicker than you would driving normally, and once stopped, the parking brake latches if you continue to hold the switch.
If you only hold the switch for 1 or 2 seconds, its only active for 1 or 2 seconds..if you let it go, and the truck hasn't stopped yet, it will keep moving forward.
Just thought it might be good to know, you can stop the truck using the button in emergencies, ie. like if the brake pedal falls off your adjustable pedal equipped truck.
If you only hold the switch for 1 or 2 seconds, its only active for 1 or 2 seconds..if you let it go, and the truck hasn't stopped yet, it will keep moving forward.
Just thought it might be good to know, you can stop the truck using the button in emergencies, ie. like if the brake pedal falls off your adjustable pedal equipped truck.