I like a firm brake pedal, and on a prior car a master cylinder brace really made a huge difference. I've done some searching, but I don't see anything like this offered for a 3IS newer than 2016. Any companies that sell them?

 

Haven't seen any MC braces for our cars unfortunately.

 

So the 3IS engine bay is pretty identical to the 2IS engine bay so you could try this out, I've just ordered one and have heard good things about it

https://www.etsy.com/uk/listing/8999...f5ed0b74a2680c

 

Not bad for $40 USD. Let us know how it turns out.