Z4 coupe brake upgrade

[FlavaDave]

So, the brakes on my zed are brilliant at low speed, really bitey and strong. But once you get on the gas a bit it doesn't take long for them to overheat. They start to "grumble" and fade heavily.

Anyone have the same problem and upgraded theirs with any success?

Hard to find anything on the net about this so hoping you guys can help out :-)

I'm hoping a performance pad might cure it, but it the discs need an upgrade too then let me know.