first of all.... mate, chill out... people on here will help you, but not if those people who require help have an attitude
secondly, there is not a speed limit as such on limp mode, it limits the way the car is driven, limits the revs, it just stops you driving the car normally, it is 'limp home' mode, ie, simply ticking over to get you home.
i would say with a fair amount of certainty that the loss of power/limp mode is probably not anything to do with the brake change.
the symptoms you describe are indicative of a failing maf, if your brakes are OK and without fault, let's forget about that.
the other thing of course, could be a turbo related issue.
BUT no matter what it is, if the car is in limp home mode, there will be codes logged, i would suggest a fault read asap to help establish the cause.
i would imagine crasher will be along soon to comment
