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Old 04-14-2021, 10:45 AM   #1
MasterOSkillio
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Join Date: Feb 2011
Default WRX to STI brake conversion (I did lots of research please lmk if I am right)

So it's time for new brakes on my 2014 WRX hatch, the stocks have no life left and I have been eyeing either the CTS V upgrade or STI brake upgrade. I have done a bunch of research, I want to confirm what I have read is correct for my year car.

1. The front: STI brakes from 2008+ caliper should bolt right on no modifications needed, I need to use a 2004 STI 5x100 rotor.
(according to KNS posts)

2. The rear: STI 2008+ caliper should bolt on no modification needed, I will need to redrill a 5x114 rotor from a 2008+STI to 5x100. E-brake should still work without mods for my WRX model year
(according to KNS posts)

3. I have a manual car so my master cylinder is the same as the STI

4. I already have SS lines, but those are the same as the STI

5. One question: Are all 2008+ STI brakes brembo? or was there a stock STI brake and the brembo was an upgrade option? I can't seem to find this, when I do a search I only see brembo, but I want to confirm.

I am asking because I found a kit that costs $80 more then CTS V swap with all the hardware, to swap the F/R brakes from a 2014 STI. I figure I will have less wheel clearance issues with the STI swap and I won't have to either drill out my steering knuckle or wait for July to come for the BWC CTS V kit to come back in stock.

Any help would be appreciated
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Old 04-18-2021, 09:09 AM   #2
Patrick Olsen
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Chapter/Region: AKIC
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1996 Impreza coupe

Default

Sounds like you've done your homework. To me, going with the OEM setup is a better option than a modified Cadillac setup.

I can't offer you anything on #1-4, but for #5, yes, all '08+ STIs (and '04-07s, for that matter) have Brembos and only Brembos. The '18+ STIs have a 6-piston setup with bigger rotors, but that doesn't matter for you since you'd be getting parts from a '14 STI.
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Old 04-18-2021, 12:22 PM   #3
DustPuppy
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Default

I don't know whether this would be a thread-jack or not, but I'm doing the same thing as MasterOSkillio and I have some of the same questions.

I have a 2018 limited (wrx) - same questions 1 and 2 - is this the same as the 2014? Also, I've read that you have to upgrade the master cylinder (I have a M/T too). I see the STI/WRX have different part numbers.

Thanks!

-Ernie
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Old 04-20-2021, 12:06 AM   #4
atbwrx
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I just pulled this swap off my 2014 hatch. 2015 STI black brembos with KNS rotors, everything ready to go. I upgraded to 2018 STI brakes all the way around.

Last edited by atbwrx; 04-20-2021 at 01:25 AM.
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Old 04-21-2021, 03:00 PM   #5
AndyRoo
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Quote:
Originally Posted by DustPuppy View Post
I don't know whether this would be a thread-jack or not, but I'm doing the same thing as MasterOSkillio and I have some of the same questions.

I have a 2018 limited (wrx) - same questions 1 and 2 - is this the same as the 2014? Also, I've read that you have to upgrade the master cylinder (I have a M/T too). I see the STI/WRX have different part numbers.

Thanks!

-Ernie
The 2015 and later WRX has a different bolt pattern for the rotors as this person's 2014. It should be a little more straightforward for you since the bolt pattern on your car is 5x114 like the STI.

- Andrew
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