Sponge brakes?

[buckwild27]

Update, after replacing all the pads, the brakes feel almost normal again, although a little spongy compared to other vehicles still.
Even though this seems to have done a lot of good, I'll probably still look into one of these newer model upgrades since y'all mentioned it.

Here's the upgrade parts for my 2014 Sierra

 

[Shubbydog]

Proper bleeding?