Re: So - should I replace my master cylinder?
I hear ya.... I just which I could be more sure than spend $300 and a huge PITA job to see if it's fixed or not, that's all.
On the other hand, it may have been "not quite right" the entire time I've had the car. Remember how I was mentioning that I never thought the E39 brakes were all that amazing and didn't modulate well. During my fall testing with fresh rear pads (that didn't have crumbling backing plates) they were pretty great on the "double press".
If I'm going to think positive, that's the story I'll tell myself LOL. They were never right and this will make them awesome. Maybe the first owner didn't put a brick under the pedal or something and damaged a seal when the car was nearly new.