What is causing the clicking noise in my front brakes?

What is your question?

Noise disappears when I slightly depress the brake pedal. I have replaced the pads, calipers, master cylinder last month. The noise persists. Not the rears. I have pulled the wheel assembly to check the bearings and there is no problem there. Noise comes on after running for a few minutes. Braking is fine, good even. no pull. no squeal or grinding. Just a clicking once per revolution. Both wheels.