Humming Noise When Brake Applied

This started to happen a few weeks ago. Whenever I apply brake with gear in D, I hear humming and If I let go and push accelarator just a bit, it disappears. No sound while I drive and it only happens when I stop. Any idea?
 
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Let me try to locate where it is coming from. No not familiar. First time happening. I changed out fuel rail a year ago but this noise just started to happen. Thanks!
 

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