We had 577 degree brakeman fluid in the lines, it was working fine until I went up to the full on race pads. For those pads I will need to duct the fog light ducts to the brakes & upgrade to the same fluid used in the F1 cars (Endless RF- 650). As for the big brake kit, there were other Z's out there having the same problem on non-race pads and big brake kits, like the porsche kit. The Baer rotors and stock calipers are not the weak point at this point, just need to run some ducting and fluid that will hold up to the temperature the pads can generate.