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Firstly, and this has been said before, I don't think anyone doubts that the M3 has better brakes than the 135, certainly in general and probably even when the extra weight of the car is taken into consideration.
The point of my original post is that to me, I expected the M3 to blow the 135 out of the water, and in reality you get an incremental performance boost (or where I live, no performance boost) for the extra cash. Also, the sentiment on the M3 boards is the same - they considered the fact that the 135 had better performance in some areas...
I've heard that replacing the brake pads makes a huge difference as street pads are designed not to squeal, which limits the compounds that can be used. I'm sure there are other factors and maybe someone who is more knowledgeable can comment on this.Several of the reviewers used track brakes.
I have no idea how thick the rotors are...
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