So I have a 1999 suburban 1500 4x4. I replaced the front calipers with new 1 ton calipers to help the stopping of this beast. New A/C Delco rotors and braided steel line was already there from lift extensions. New 1/2 pads. Bled the system but must have air in the abs so gonna take it to the shop. The question I have is it sounds like there is a ton of crap between the rotors and pads. I cleaned everything after the install. Taken it to the car wash 3 times and sprayed the hell out of the rotors. Still lots of noise. Even when not applying brake pressure tons or scraping noise. I know I’m gonna have to jump in there to see what I can see, but didn’t know if somebody could give me a heads up of what it probably is.