987.1 Cayman S Brake Booster Question

[MPD in SC]

Hello all,

I have a 2006 Cayman S which I bought early in 2023. The car is in very good condition with low miles and I have been correcting any issues that the car had, such as the a/c vents blowing out foam bits, etc.

The brakes on the car were good, but I don't like drilled rotors and I wanted more bite in the pads. So I replaced the F/R drilled rotors with Sebro slotted rotors and used Hawk HP+ pads for more bite. Based on what I've seen on many of the forums I also replaced the master cylinder with the GT3 mc, new fluid, SS brake lines.

Based purely on personal preference, I would like more assist out of the brake booster. Consequently I am wondering if anyone knows of a Porsche Brake booster which will fit on my Cayman S, but which has increased boost? I imagine this would require all dimensions to remain the same except for the diameter of the (new) booster, which would be slightly larger than the current one.

Has anyone done this? Again, this mod (if it can be done) would be based on how I would like the car to be - we each have our personal preferences.

[stealthn]

May I ask why you need more braking? I find my 06 CS has hand of God stopping power with the factory setup and good pads and rotors, are you tracking yours a lot?

Cheers

[MPD in SC]

Well, I'm comparing the braking to my other car, an inexpensive (but very capable and fun) 2019 Hyundai Veloster N. I do occasionally track that car, as I have tracked other cars I have owned. The Cayman S (in my opinion) is a great platform, but out of the box I'm not really too impressed by the brakes.

The Cayman S came (as do many cars) with drilled steel rotors, which are not engineered for hard repeated braking in track days. Each of those holes is a significant crack initiator - they are great for marketing (people love the looks), but not for track use. Plain or properly slotted rotors are better. The small size of the factory rotors aren't ideal for thermal management/heat dissipation or braking torque either - they aren't really designed for track usage, but they are fine for a street sports car. The Brembo calipers are fine, and I may go the Girodisc route but haven't decided yet.

Realistically the things I've already done to the brakes would be enough for my mild track driving. The braking feel I'm targeting is entirely preferential. I like the Hawk HP+ pads. I've used them before principally for the street and mild autocross or track days. The brake feel is also not an actual problem, I just want to see if there are other options. Some people hate more boost, some want more. It's pretty subjective.

But at any rate I'm hoping that somebody out there may have actual technical information about Porsche brake boost assist ratios that might fit my car.