Originally Posted by KINGLEH
thats just not true...
driving hard enough... you will cook stock M brakes.....
Just to add my $0.02, I think this is incorrect.
I speak as someone whose car is, as I type, in the shop having a Brembo 6/4 bbk installed.
However, I should add that I had ordered the BBK prior to receiving the car (based on my E46 experience) and prior to tracking my E92 recently.
I was surprised at how the stock brakes held up on a track that is known to be hard on brakes. Now I wasn't probably braking right to the limits (mainly because the DCT issue meant I was trying not to trigger abs), but the performance was sufficient that I reckoned a pad/hose/fluid change would make them more than acceptable for most people.
This is because the nature of the degradation in performance (i.e. longer/spongier pedal travel) points more to a boiled fluid/expanded hose issue, than any issue with the calipers being overwhelmed and failing to clamp properly.
As I said, I have a bbk being installed and it looks absolutely fabulous, but the stock brakes are not lacking in power.