Hi all - 1968 GTO with front disc conversion from Right Stuff. Basically regular single piston A-Body calipers 69' and beyond. I installed new semi-metallic pads. greased in the appropriate areas only, reseated calipers and bled front brakes. Now, just as I apply brakes, I can hear the pads "clack" once. No noise when driving or on bumps, appropriate pedal feel and stopping power. But I HATE weird noises. Almost always a sign of something not correct. The conversion, and thus calipers are 12 yrs old but only about 5000 miles on them. They look fine, fluid fine. etc. What gives? did I seat them incorrectly?