So I was reaching out to
Zeckhausen Racing to get the Ferodo DS3.12 for the OEM calipers, and told him that I was switching from Macan back to the OEM, and he asked if it was a race series issue or something else. Dave was super and has tons of information, and knows all things brakes.
He said that the master cylinder should be sufficient:
I told him about the issues that track users faced, such as initial brake pedal issues, and he said
The solution looks like this.
View attachment 200618
He then suggested
So, the pistons that work have the shortest length of 29.5mm, so if that diagram is correct, the stock ones are too short. If someone can confirm the measurements that would be great. Otherwise I will be going back to stock in the upcoming weeks, and will try then to measure. His gut feeling is that they are 30mm, but we would need to get an actual measurement to know.
View attachment 200619
If the piston length is shorter than 29.5 and is machined, the springs to use are 8 of these:
https://www.zeckhausen.com/catalog/product_info.php?products_id=22044
This is the first time someone with some braking knowledge even tried to explain these issues. Sounds very interesting and would love to see if it solves the problem. Edit: There is a warning on the page that it can accelerate wear on pads, so that is something else to be aware of. This depends on the spring rate used. Dave said the .4in should not drag the brakes in a daily, and .6in could be used in a track car with severe knockback and should not drag the brakes in either case.
I would reach out to Dave and Zeckhausen racing for any braking needs/information in the future.