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That's interesting to hear. Having tested another caliper and finding the same issue, but in that vehicle the brakes work exceptionally well (Audi RS4), I realized that there was something else going on.
The RS4 has a 25.4mm MC piston, similar to the updated MC I added to my Z4. Once going larger on the piston size, my issue with the pedal drop went away. That suggests to me that there is a certain limit of internal pressure the stoptech kit can withstand before it potentially weeps past the caliper seals. If you get to close to that threshold, it's possible the issues start.
It's a great looking kit and when it works, it works, but I'm looking at alternatives now that I'm hearing rumors the company Stoptech may not be around able to keep up with future business anymore (see my other thread on this).
I may have this kit up for sale soon with Z4M and/or non-M adapters if anyone will want it for a good price.
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