Share This Story, Choose Your Platform! By Calvin | March 1, 2021 https://youtu.be/Ar5zIqZN4zI You may not realize this but brake friction material is actually porous. This porosity can cause water to make its way to the backing plate. When this happens corrosion happens. Corrosion happens between the friction material and the backing plate you get delamination. This is a big safety issue.