well, when first reading this i first thought for you to check your abs brakes to see that they are working properly, i think i understand that you feel the toc noise through the brake pedal? Also you could maybe look up under the car and trace the lines and peices that connect to the pedal from the outside in the engine bay part maybe and you might find something there, i hear alot of people talking about noises in their bimmers, i too have the loud noise when heat is engauged, too bad they don't stay quiet, if you find the problem please post so i can check mine before it starts! hope this helps!
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