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Old 10-21-2011, 10:39 PM   #1
SW21MR2
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Lightbulb STi Brembo upgrade for 2008-2011 WRX while staying 5x100

So I've received a high number of PMs which made me decide to write this post on upgrading to STi Brembos on the 2008-2011 WRX while sticking with the 5x100 hubs. Of course there are other ways to approach this, but this thread will be my generic response to future PMs on how I did my upgrade. I will try to keep this as simple as possible.

Here's what you need:

!!!10mm FLARE WRENCH!!! Yes, you need one, and a good one. You may also need to use a small torch on the hard-line nuts. When all else fails, you can always resort to vice grips

2004-2011 Front STi Brembo calipers w/ all the mounting hardware & pads
(These will bolt on with no modification to the dust shield)

2008-2011 Rear STi Brembo calipers w/ all the mounting hardware & pads
(The dust shield lip will need to be trimmed. I used $10 sheet metal snips.)

2004 STi Front brake rotor or 2005-2011 brake rotors re-drilled for 5x100
2008-2011 rear rotors re-drilled for 5x100

2008-2011 rear STi brake lines.
(The bend on the caliper side is different)
*It appears that StopTech is no longer making the STi only rear brake line, and the part number is the same as the regular WRX number. I'm not sure if SS lines for the WRX from other manufacturers will work universally.

This is optional but recommended:
2008-2011 Steel braided lines
2008-2011 Grimmspeed master cylinder brace

Controversial stuff:
2008-2011 STi Brake master cylinder (I did not do this)
2008-2011 STi Rear brake dynamic damper (didn't even come on the 08+ rear calipers)
2008-2011 STi Front dust shield (you really don't need this)

This is what I did:
I picked up some used Brembos off one of the classified threads. The fronts were 2004-2007 golds, and I'm not sure the specific year. The seller stated the rears were from a 2010. I originally intended to just slap them on, but my friends convinced me to paint them.

I sanded them down put on two coats of 900 Degree Red VHT paint, let them dry for a day, placed on the eBay Brembo decals, and put two coats of 500 degree Rustoleum clear engine enamel.

The calipers did not come with bolts or any mounting hardware, so I hard ordered the caliper bolts from Subaru part numbers:

901120103 (Front)
901120102 (Rear)

Instead of ordering each individual part for the pins, pad springs, cotter pins, etc... I just ordered the caliper kits from Autozone:

Duralast/Brake Disc Hardware Kit - Front
For your 2004 Subaru Impreza AWD 2.5L SFI Turbo DOHC 4cyl
Part Number: 13535

Duralast/Brake Disc Hardware Kit - Rear
For your 2004 Subaru Impreza AWD 2.5L SFI Turbo DOHC 4cyl
Part Number: 13550

The David from V1Spec in Garden Grove, CA made my slotted rotors. I asked if he could re-pattern 2010 STi 5x114.3 rotors to 5x100 and he did it without much question. I ended up getting some Posiquiet ceramic pads with them for a good price. I had a handful of brake vendors turn me down when it came to re-patterning or they wanted to charge way more money to have it done.

I also ordered some 2010 STi Stoptech lines since the OEM ones were also not included with my calipers.

I already had a Grimmspeed brake master cylinder brace. I've used Motul RBF600 in all the cars I've owned, so that's the fluid I naturally went with.

I've been on these brakes for about 5000 miles now. They definitely feel better than my friend's 2011 STi Sedan, but they make noise on cold mornings on the first stop attempt. I'm still on the OEM Dunlops, so I'm sure the stopping distance is still better on the stock STi.

Was it worth the coin? Most definitely.


04-07 Front Brembos

08+ STi Rear Brembos

Painted





Oh yeah, you're gonna need wheels that can clear the Brembos.

...or spacers.
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Last edited by SW21MR2; 06-21-2013 at 11:05 AM. Reason: Fixed Pictures
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Old 10-22-2011, 05:34 PM   #2
rsutton1223
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Great write up. I am thinking about doing this as well. How much did this end up costing you all together?
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Old 10-22-2011, 09:03 PM   #3
SW21MR2
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Quote:
Originally Posted by rsutton1223 View Post
Great write up. I am thinking about doing this as well. How much did this end up costing you all together?
It was about $1800 because I was impatient. I over paid for the calipers.

Edit:

All together it did come out substantially more. I purchased the Brembo calipers with no mounting hardware and bolts for $1300 before shipping. So, my initial estimate I made on this post is substantially lower than I REALLY paid for everything. I'm sure you can do it for less if you're really good at scavenging for and patient.

Last edited by SW21MR2; 03-30-2012 at 08:48 PM. Reason: More details
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Old 10-22-2011, 11:21 PM   #4
Power6
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A bit of feedback:

The STI has the same MC as the WRX. The booster is different, probably not worth swapping though.

What is this "STI Dynamic Damper"?

Nice to have a post where people can find all this swap info there are always questions.
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Old 10-24-2011, 01:42 PM   #5
SW21MR2
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The dynamic damper is that weight that mounts between the rear caliper bolts and hub.

I just looked under my friend's 2011 STi and it doesn't have it. I guess it's only on previous generations. I guess that tells you that it's not necessary.
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Old 10-25-2011, 12:56 AM   #6
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Quote:
Originally Posted by SW21MR2 View Post
The dynamic damper is that weight that mounts between the rear caliper bolts and hub.

I just looked under my friend's 2011 STi and it doesn't have it. I guess it's only on previous generations. I guess that tells you that it's not necessary.
I have like 600 of those things.....

Subaru tried everything short of a seance to quiet the howling Brembo's. NOTHING is guaranteed to work. It is not every car - but when you get it...ouch.

Nice install btw. very cleanly!

I looked at the AZ hardware kit - I see it has the EVO style pins. (no cotter) Did those work in the STi Brembo's?

The cross springs look a bit frail - but Subaru charges rather unfairly for the hardware. As long as it retains the pads and doesn't rattle then good to go.
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Old 10-25-2011, 02:23 PM   #7
GravyRobber
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Subscribed. Putting together a Brembo setup for my '08 as we speak. Good source for info here!
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Old 10-25-2011, 10:21 PM   #8
pooster.online
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whatd you paint them with? did you use a primer/ clear coat?? looks great!
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Old 10-26-2011, 06:42 PM   #9
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sticky!
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Old 10-26-2011, 06:44 PM   #10
jacjac3
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I wonder if this would be a hassle finding rotors when it comes time to replace. WOuld I always need to redrill 5x114 rotors to 5x100?
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Old 10-27-2011, 10:35 AM   #11
Ric WRX
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Most DBA rotors are double drilled. I have Brembos f/r and DBA rotors the fronts came double drilled. I got the rears from WRXBrakes and they drilled them for me. I recently read that DBA has taken note of the rears and that they are double drilling those on 08+ rotors.
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Old 10-27-2011, 10:37 AM   #12
Power6
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Quote:
Originally Posted by jacjac3 View Post
I wonder if this would be a hassle finding rotors when it comes time to replace. WOuld I always need to redrill 5x114 rotors to 5x100?
It isn't that bad. Think of this compared to say another brake kit like Wilwood or StopTech, where you need to buy the rotors from the original mfr forever. In the case of Wilwood you have to buy their pads too.

This is at least mostly a standard application. The front rotor, you just buy a replacement for a 2004 STi and you are good. For the rear, you need a 2008 STI rear rotor re-drilled. The Brembo swap is so popular that many vendors get on board with drilling the rotor, such as DBA, and I think WRX brakes will re-drill for any STI rear rotor they carry. Both of those vendors have been around for a while.

And the worst that will happen, is you buy a new rotor for an STI anywhere, find a local shop to re-drill it.
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Old 10-27-2011, 12:06 PM   #13
KNS Brakes
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Here are the rears on an 08+ using a goldie.



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Old 10-28-2011, 04:08 PM   #14
SW21MR2
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Quote:
Originally Posted by pooster.online View Post
whatd you paint them with? did you use a primer/ clear coat?? looks great!
I just sanded down the entire surface of the caliper so it was nice and keyed up. Then I sprayed on two coats of VHT 900 Degree caliper paint.

You need to give the calipers at least a day to dry before applying any decals. I put one on early and as I was pulling off the clear part it took some of the paint off with it, so I had to redo one caliper.


This is the caliper I had to redo. It actually turned out better than the first time.

*note: Make sure you have enough paint. I thought 2 cans of Red would be enough, but it wasn't. If you look at the rear caliper, you can see that it's not as smooth and some of the sanded black is sorta showing through.

After I could apply the decals, I put on two coats of Rustoleum 500 degree clear engine enamel. Careful with this one because it's hard to tell how thick you're spraying.

Some people actually bake them, but I just let them stand for a week before installing them.

The calipers are far from perfect. The deep gouges and chips down to the metal are still sort of visible upon close inspection. Next time around I plan to have them blasted. Not sure what color to go with though.



This picture is from a couple months back when I was doing my coilovers. The only damage the paint has taken is when I accidently hit the caliper with my small 17s.

Last edited by SW21MR2; 10-28-2011 at 04:14 PM.
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Old 10-28-2011, 04:20 PM   #15
SW21MR2
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Quote:
Originally Posted by WRXBrakes View Post
I have like 600 of those things.....

Subaru tried everything short of a seance to quiet the howling Brembo's. NOTHING is guaranteed to work. It is not every car - but when you get it...ouch.

Nice install btw. very cleanly!

I looked at the AZ hardware kit - I see it has the EVO style pins. (no cotter) Did those work in the STi Brembo's?

The cross springs look a bit frail - but Subaru charges rather unfairly for the hardware. As long as it retains the pads and doesn't rattle then good to go.
The hardware kits did come with cotter pins that would go through the cross pins. Everything was very tight, but that could be primarily from repainting the calipers.
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Old 10-30-2011, 12:05 PM   #16
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What did you do about the difference for the e-brake on the rears. The STi's use 190mm e-brake shoes, and the WRX uses 170mm. Did you buy STi shoes also, or are you running without an e-brake?
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Old 10-30-2011, 12:30 PM   #17
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That's not the case on the 08+ WRX/09 FXT/'10 LGT - P-Brake is now 190mm
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Old 10-30-2011, 01:00 PM   #18
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AWESOME info WRXBrakes! Thank you!
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Old 10-30-2011, 07:13 PM   #19
Cheveyboy
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Man I wish they would clear OE '09 rims.
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Old 11-01-2011, 09:23 PM   #20
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Does the Brembo STi BBK clear the stock 2011 17x8 dark gray wheels.
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Old 11-01-2011, 10:18 PM   #21
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I'm actually doing this swap myself this weekend, I found an STI donor so ill be re drilling the STI rotors to 5x100 specs and just swapping everything from the STI to the WRX.

Great info OP.
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Old 11-01-2011, 10:32 PM   #22
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10mm flare wrench dont work for me. Infact, it rounded the nut. so, I use 2 vise grip. One to hold the bottom nut and one to hold the top part of the stock brake line. Then twist and voila!

When you install the stainless steel brake hose, the new hose has a nut build in on top.Use vise grip on the bottom portion and regular wrench.
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Old 11-02-2011, 01:12 AM   #23
SW21MR2
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Quote:
Originally Posted by Ysidro View Post
10mm flare wrench dont work for me. Infact, it rounded the nut. so, I use 2 vise grip. One to hold the bottom nut and one to hold the top part of the stock brake line. Then twist and voila!

When you install the stainless steel brake hose, the new hose has a nut build in on top.Use vise grip on the bottom portion and regular wrench.
Not all flare wrenches are built equal. The first couple times my regular 10mm slipped, I had my friend buy a flare wrench and bring a small torch. I heated up each nut and they came off like butter.
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Old 11-04-2011, 10:59 PM   #24
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Quote:
Originally Posted by wrxman02 View Post
Does the Brembo STi BBK clear the stock 2011 17x8 dark gray wheels.
I think they clear the rears the front you'll probably have to get +15mm spacers or larger and extended studs.
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Old 11-05-2011, 07:34 PM   #25
JTraction
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Hmm. I still don't understand why people go to all the trouble of doing this swap when you can get a new, engineered for your WRX, ST40 kit for about the same price.
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