What is brake pad glazing?
Brake pads contain various metals and minerals that are bound together using a resin. At high temperature, this resin turns to liquid and can bleed out onto the rotor. Glazing is dangerous because it prevents normal contact between the pad and the rotor so you lose pad bite. Glazing can also cause brake pulsation most commonly called “rotor warping”. Drilled rotors prevent pad glazing as reported in SAE paper 2006-01-0691. This is one of the reasons why drilled rotors provide 12% to 37% more brake torque over stock rotors.
