I always hold the brake while putting it in park and shutting the truck off. I’ve never had the hard brake issue. If I remember, I’ll pump the brakes with the engine off and see how many pushes I get before getting the hard pedal.IMO these brake boosters don't hold enough vaccum for more than 1 power assist, with the engine off.
Are you guys on the brake pedal while turning your truck off to park?
I tried this and sure enough next start brake pedal was hard for me.
Edit: I started the truck after sitting for a couple of hours. On the third push of the brake pedal, it did not go down as far, it stopped and would not go farther. I did not dare try a 4th push. It did start when I hit the start switch.