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It is assumed that the brake disc helps to discharge th […]
It is assumed that the brake disc helps to discharge the gas produced when the resin binder in the brake pad material starts to decompose at extreme temperatures. When this occurs, the pedal is still strong and the coefficient of friction decreases, resulting in a loss of braking effect.
Racers often refer to this as "green mat desalination" or "degassing". Using new technology, prefabricated carbon fiber or ceramic car brake pads, this gas accumulation is no longer a major concern.
The less exotic street components still have a degassing problem, but are rarely seen on the street only when used on extreme temperature tracks. Another theory is that drilling a plurality of holes in the rotor surface increases the friction coefficient between the pad and the rotor, as all additional small edges enable the pads to bite more effectively. But today's modern carbon fiber pads are designed to operate at higher heat with a higher friction coefficient, so any extra hard edges are redundant.
However, there are a lot of potential defects in the drilling rotors: micro-cracks diffused from the holes. This could be a special problem for street-driving cars.