2000 Mazda MPV we drive. Just had brake overhaul job done, rotors, calipers, and pads. When brake pedal is applied there is a CLUNK. Sometimes louder, sometimes quieter. Almost everytime though it will happen, didn't do this with old parts. I have tried to locate this sound as good as i can and it seems it might be somewhere right under the brake pedal, maybe not even the brakes. All I know is I apply the brake pedal and something below me goes CLUNK.

Can anyone help with this? THAnks