Originally Posted By: mazdamonky
For the people who call it a waste of time, in theory think about the weight added to your wheels from a thick layer of brake dust. I have measured before due to the sheer amount of dust that collects on my rx7's wheels. 2.5lbs lighter after cleaning inside and out. So in reality, it does make your car ever so slightly more efficient as it is weight reduction. It isn't useless. Just negligible.
How can you have 2.5 lbs worth of brake dust when the pads themselves don't weight much more than that?