the brake boost is amped up on "sport mode" to be more responsive and is more squishy and longer on "comfort mode" so it doesn't feel too sensitive and abrupt for most daily driving situations. I wish it was just one way that felt good. bunk.
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X3 M40i G01, M235i F22, 335 F30 MSport, 135 DCT, 335 E92, Audi A3