When I apply the brakes, the vehicle shakes and also the brake pedel grabs on 1997 Chevrolet Suburban 2500

brake pedel grabs and sometimes the pedel will go all the way down till it stops. sometimes and I here metel grinding when I first apply the brakes in the morinig but stops shortly there after.

Asked by for the 1997 Chevrolet Suburban 2500
You may have worped and possibly cracked rotors I haul a equipment trailer and my rotors would heat up and worp sometimes crack and shake me up as far as the brakes grabbing you may be metal on metal I would strongly suggest a visual inspection of the rotors and pads possibly your hole brake and abs system