Incorrect installation of directional louvres on disc brake rotors can cause

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Directionally cooled rotors rely on the designed airflow path to carry heat away from the braking surfaces. When the louvres are installed incorrectly, that cooling path is compromised, so heat builds up faster during braking. Excessive heat reduces the friction efficiency of the pads and can even cause pad gas or rotor glazing, leading to brake fade. In short, poor cooling from misinstalled directional louvres lets the brakes overheat, which makes braking power fade away as you continue to use them.