I flushed my own brakes the other-day and was horrified of how nasty the old fluid was. The fluid has gelled in the real calipers, it was like a thick gooey substance that came out. I flushed the whole system putting in high performance fluid and I noticed a very big difference in braking afterwords. Most likely due to the coagulation of the fluid in the rear calipers. My car is a sig 100 and had 30,000 miles on it. I also inspected the rotors and they had minimal wear and the pads were also in good shape so the fluid didn't gel due to heavy usage of the brakes just age. Edit: So far only my car has had this issue, so this seams to be an isolated issue. There does not appear to be an issue with EV's or the roadsters breaks until someone else can confirm the same problem.