I have a 2014 Sierra slt 6.2.
i had a clunking from by front brakes on Both sides when stopping and low speeds. I took brakes apart and put them back together and the noise went away. About about a month later I started getting a bad clicking when turning both directions. Local mechanic said it was either hub and bearing assembly or cv axle so I replaced both on driver and passenger side.
the clicking stopped for about a week and came back and the brake clunking is back.