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I went to another dealer today. Their technician drove my car and after visually inspecting the brakes, told me that it is normal for the brakes to produce that sound when they are wet. In my car, since I have bigger 22" wheels, the gap between the rotor and the wheel is large and thus the rotors and the backing plate easily get wet. He explained me that a BMW wheels is designed in such a way that it acts like a fan and throws air out while rotating at high speeds and thus helps dry the rotors. In my case, since the wheels are big, there is tremendous amount of open space between each spoke and the gap the between the rotor and wheel is large, so the rotors are not drying fast enough and instead are getting more wet.
I guess I'll have to live with this. Folks using 22" aftermarket wheels on their X5: do you also notice something similar?
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