[Richbot]

My car has had a Stoptech Trophy front 355mm kit on it since 60,000 miles and 2014. It's older than one of my kids, and has more miles on it than two of my other entire cars (M3 is currently at 137k and cruising) It's had one (1) pad change from the ST sport pads it came with, to DS2500's. Still on original rotors that came with the kit. Probably partially thanks to no knockback springs

So it's made me lazy. But it also has the knockback typical of a lot of the 4pot Stoptech kits, and that's making me angry, despite the excellent durability of the kit overall.

The DS2500's probably have one track day left in them and then I imagine the rotors will be ready for new rings too. And that's starting to turn into real money.

Should I kill it with fire and get an AP372 or similar front kit, or look at anti-knockback springs for my STR40 calipers, or what? This is an almost exclusively fair-weather street and very occasional (like 3-4 sessions every two years) track day car.

My dilemma is A) like I said, these have been so trouble-free and cheap to run that I hate to spend much money on upgrading yet again and B) it's actually a very light front kit, and I have no need for a bigger rotor, I just need the knockback to go away and C) gold hats are cool. So I hate to bin the whole thing.

So...anybody successfully killed knockback on their ST40/STR40 front kit? How did it act on the street with knockback springs install? It looks like the low-drag springs are all backordered and so are the 355x35 ring replacement kits, so this isn't really a now problem.