I fried my third set of front Brembos yesterday at Thunderhill and I think its time for bigger brakes. I'm looking at the 380mm six piston Brembo or the 355mm six piston StopTech. I will also upgrade the rears with two pistons. The Brembos are big bucks, but I think they will be worth it. I have a couple of questions:

1. Any fitment issues with the Brembos? My primary wheels are 18x9.5-114.30 +35 but I also have a set of 18X8.5-114.30 +35 wheels.
2. Are replacement rotors rings readily available? I assume Cobalt makes pads for both set ups.
3. Slotted or drilled. Currently use slotted.
4. Can the StopTech work with stock sized Girodisk 2 piece rotors? Just getting the calipers will save big bucks and I already have spare front and rear rings.

1 failed caliper X 120 mph = 270 degrees

 

The cheap upgrade for brakes is my brackets for wilwood Aero6 so you can run stock or X size rotors. If I wanted anything more than that Id run the same kit @Balrok has. Forgetting the name of it, but it seems like the best option for big boy braking.

EDIT: Here's the thread that has all the info you need.

https://www.evolutionm.net/forums/mo...nt-brakes.html

 

Yep bunch of info in there already. The two kits you mention are not "motorsport" grade kits. You'll want to focus on that instead of how "big" they are. Also you didn't detail anything about the failure that leads you to believe something bigger would hold up? 270deg is nothing, you see that on the street. Much bigger then 280 and you'll likely require 19's.

 

I beat on my Stoptech Trophy kit all day long on Thunderhill 5 mile on a 90* day with zero issues and zero brake fade with ST47 pads and 550whp.

With the OEM brembo calipers I always had to cut the sessions short.

Zero reason to upgrade the rears. Don't waste your money.

 

Its more impressive that you ran 550whp all day long on a 90* day

 

Trophy works, but when they specifically use the words "pistons" like 120 pistons would work better then they're usually referring to what I call the "black and red" streety kits which are no stiffer then the oem brembo's.

 

First, thanks for the quick responses, just the info I was looking for. So now its down to AP Racing or Stoptech Trophy.

Good link, Budget is not a big deal, but I don't want to throw away money.

Excellent point. I don't feel a big need for more stopping power, I just want stopping power that is not going to fail, even when I'm driving like ****.

Will the Trophy calipers work with my existing rotors?

 

Between the two AP kits - the 8350's are an excellent kit at a decent price point. As several others pointed out it *can* get hot only because the disc aka heat sink is a little small but you can run brake ducting to resolve this. Now due to the technology built into these J-Hook discs they can still take many times more heat and abuse then your off-the-shelf OEM size stoptech/centric rotor which we all know and love. But that comes at a price$. The rest is all self explanatory - weight savings, heat, expansion, stiffness, etc etc etc.

The 9660/9668 kits are bigger and better in almost all aspects. The radi-cal calipers are something else in terms of how the technology has advanced to increase stiffness and reduce weight. But they come at the cost of running 18's and having more expensive consumables.

If you're doing 15+ laps, have 18's already, or are doing enough track days to justify the RadiCAL's then I'd go with those. If you're concerned about weight or just want a more affordable that's streetable too then the 8350's serve well. I've spent so much time with them I became a reseller so it's easy for me to get it to you cheaper then retail.

Trophy's I've heard nothing but good things about, but I just don't have personal experience with them.

 

What percentage better are the 8350's then the stock brembo presuming pads are similar. I tracked my stock brembo's with XP8 pads and ducts at Sebring@450whp and they were "ok" But I would prefer more braking power. I'm at a novice level and would be on small 235-255 slicks.

Will they fit under a 17x9 et35 TC105n?

 

I have no idea. The trophy kit has larger rotors.

 

I did a LOT of research last fall and landed in AP racing. IMO they’re the best Motorsports setup.

silluck2 got Dallas’s brakes and wilwood 6 pistons. For the cost to benefit they seem to be hard to beat. We’ll see when he gets the track next month.

 

They fit under stock wheels so yes. I'd wager a 300% "better" number over stock brembo's. I thoroughly abused them at Sebring, improved my entry into the hairpin by about 75 feet more on power before having to brake. IF you want to keep stock rotors and run brake ducting still then the best bang is the Aero 6's with Dallas's brackets. Those would be 150% better in round about numbers.

When I look at the rear brakes I think about the "total performance" of the car. Sure they "work" in stock brembo form, but all ya'll know from an engineering stand point they do nothing to IMPROVE the performance of the car no matter what pad you stick back there. Austin's brackets to install the smaller 8350 will be massive in terms of almost everything BESIDES initial torque. Not to mention how ugly it is back there all brown and scratched to hell lol. It's like this new Oil pan Mike is coming out with - is it going to improve Kyoo's lap times? Hell no. But is it going to improve THAT part of the car's performance so he has one less thing to worry about? Hell yes. Do you need to be a pro driver to see that lap improvement, not really, seat time would suffice.

 

So is austin looking to install a smaller lighter caliper in the rear? interesting and probably the only way i can see you can improve the rear brake performance as the cars are massively over braked in the rear especially once u get good discs and pads etc.

I still feel like its one of those mods that you do on gran turismo when youve already bought every other upgrade lol. Money better spent elsewhere unless youve run out of things to do.

 

Youve already had plenty of advice etc but quick answers to ur questions.

1, youll struggle to fit most 18s over a 380mm brake kit. 362mm
2, if you mean the outer part of the brake disc then yes AP Brembo etc all do kits off the shelf. Hats youll need to get made or buy a kit
3, Never used drilled in a motorsport application they are very susceptable to cracking. Always slotted.
4. Girodisc discs are a street/show disc and too soft for motorsport. better off to sell those discs off to a street friend and get AP or something else which is more motorsport orientated

The biggest gains youll get are from ducting. im not sure what you mean about the 270degrees but if you mean temp then thats not very high. if your up around 1000deg thats when your in trouble.

 

I think I'm going with the AP Racing 9660 for the fronts. The website says they are designed to work with OEM rears and I happen to have some never tracked, shiny red, rear Brembos sitting around.
270 degrees is the spin that resulted in applying brakes with only one working front brake.