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Did you replace with stock or what aftermarket rotors?
Stock rotors. They're more than adequate for moet use, and they seem to hold up well on track. I only replaced them because the stupod Carbotech pads smeared all over them and they pulsed like crazy. :(
 

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Yes, I understand the physics of braking. Yes, I realise that the front does considerably more work than the rear, especially in this car as most of the weight is up front. But, I'm suggesting there is a bit of extra weight in the rear compared to an ST given this car's AWD system (I'd be curious to know the weight distribution). I was also suggesting that manufacturers tend to deliberately leave a bit on the table when it comes to rear braking forces as they don't want people locking the rears under either changeable conditions or when driving at the limit.

Like it or not, the rears still represent part of the overall stopping power of the car and if we're talking about out and out maximum performance alone (which I was), then they shouldn't be overlooked. I do understand however, that this is a street car first and a "track car" second.
Totally agree. A good brake system is to maintain the entire brake system dynamically balanced at any stopping situation, not just the load and force distribution. I happened to know a "reduced" bias brake kit was developed by RacingBrake for Viper rear brake which has changed how Viper track racers brake.
 

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I am going to go a bit of a different direction than most on a brake mod. I may look back and declare myself stupid and flushing money down the drain, but this is a personal preference thing.

Background
I will be installing the Tune+400 kit and that is more than enough power for me for a DD and non-dedicated track car that mine will be (although I will have a hard time passing up a supplemental oil cooler or a real RDU cooling/nonshutdown solution). On the other hand my experience with my Golf R brakes combined with an understeering awd haldex system as the weakest link when tracking really bothered me, and I want great brakes, as light as possible to get the job done fade free. Same goes for suspension related upgrades for the track.

I already took care of a nice chunk of corner weight going to a set of Team Dynamics Pro Race 1.4 forged at 19x8.5. Put Michelin SS's on it at 245/35r19. They are great but in hindsight I could easily have gone to 255/30, and will next time.

Suspension wise I see some really nice coilover/camber plate and anti sway bar options are stacking up and that is on my list for the Spring as well. Luckily I am not that far from Sleeper/FW Motorsports/Blakes Garage folks and I will probably get some recommendations and install help there after they evaluate their upgrades.

Brakes
Which brings me to brakes. Damn the Brembos are good. But they are also heavy, use expensive pads, and only have a relatively unbeefy one piece rotor setup (folks noticed this when looking at the Stoptech rotor only upgrades). So, I did a bunch of research and came up with what is a great solution for me (at least on paper, have to do the install and evaluation). Will do a how to vid if enough people are interested. I decided to pass on the AP/Essex option already out there as they required a wheel spacer to work. What to do?

Wilwood and TCE Performance were the ticket. I had seen Wilwood stuff for the ST. Then I saw the RS brake kit for the ST and had a eureka moment (As I was watching the CJ Pony upgrade/install).

I emailed Wilwood directly and they referred me to TCE - whom I would wholeheartedly recommend on so many levels, first and foremost super knowledgeable with amazing customer service. Great web resources to learn from as well for build/bedding/maintenance and rebuild, etc. And their pricing is excellent. Not salesy or pushy either.

Todd, as in the T, from TCE was incredible, patient and helped me learn. After which I got to the following solution for my needs. Plug and play bolt on TCE/Wilwood racing package - 6-pot Aero calipers with Thermlok pistons on 14.25x1.25 vented slotted two piece rotors for the fronts, and a plug and play bolt on 2-pot Piston matching sliding rear calipers kit with 100% e-brake compatiblity on 12 inch two piece slotted rotors for the rears. Full stainless lines, BP20 pads up front, BP10 for the rears (at least until I start tracking again in the Spring). All required mounting parts, etc.

All in all a beefier but lighter system with two piece slotted rotors that I think will be amazing. Did I absolutely need to do the rears. Nope. Will it be matching and beautiful with lighter better 2 piece rotors? Yep. Will I keep the unique blue Brembos for remount down the road if I ever sell. Yep. Will I end up with less loud calipers visually and hopefully less attention from the ticket gods, hopefully. I am doing inlays to make all of the exterior accents on a black and white theme so they will blend beautifully.

Wish me luck. This should be a fun install and change. Not sure how soon as I am now in full swing ski nut mode with my winter wheelset mounted and new snow in Tahoe. Really hard to wrench when powder beckons!

General TCE
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Focus Specific TCE
Focus 2012+ - Kits

And, Wilwood now actually has an option to change caliper colors to customize if you want it. But I chose black.
Did you pull the trigger on TCE brakes?, im interested on knowing weight difference vs the OEM RS system
 

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I bought all of it. I have not had a chance to weigh the new setup. I have been working a ton and my RS has been in and out of service trying to get my PTU leak solved before I do any mods. I will probably have a chance in a few weeks.
 
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