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Old 08-22-2013, 02:07 AM   #1
Metalhead19d
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Default HOW TO- STi Brembo to WRX Subaru 4/2 pot swap.

WHEN I SAY SWAP I MEAN ALL HARDWARE... BOLTS AND ALL. IF YOU HAVE THOSE STUPID BRACKETS ON THE STI LIKE I DID GET RID OF THEM IF YOU CAN. THEY ARE USELESS. IF THEY ARE LIKE MY BOLTS WITH THE STUPID SPACING BRACKET THEY MUST GO WITH THE BREMBOS.

YOU MAY EXPERIENCE STRIPPED THREADDING ON THE STI BREMBOS DUE TO STEEL BOLTS IN ALUMINUM CALIPERS AND WILL FEEL LIKE CROSS THREADING WHEN LOOSENING. INVEST IN A TIMESERT KIT TO FIX THEM (M12x1.25 or 1.75 front and i dont know for the rear... mine were already repaired by mechanic and didnt run into that issue for the rear)

Ok this is my first write up so bear with me I have good info and first hand experience. This is a bit of a walkthrough with and 05 WRX STi and an 07 WRX.

Mind you this can be pretty much done with alot of different year STis and the 06-07 WRX. Do a search on it to find fitment guides but I think this will help answer alot of questions
http://forums.nasioc.com/forums/show...ght=brembo+faq

Anyway so this is my back story.

I have a 2005 WRX STi and I was looking to do a rally build. As alot of you know the Brembo calipers wont allow anything less than a 17 inch rim. So I decided to look into the Subaru 4/2 pot conversion and I found hope.

For my car and a few other years of STi (04 STi being the easiers because bolt pattern) you can pretty much do a direct swap..... so to speak. Howerever there ARE SOME PROBLEMS. Easy problems to fix so done worry.

For the STi owner you will need a set of DBA rotors from Broken Motorsports in NJ (they own the patent from DBA so you must go through Broken Motorsports because DBA doesnt even have the part number.... (they own the rights $20k out of their pocket to helps us dirty rally guys is a good thing tho) The total cost of all four rotors is $460 plus about $60 in shipping at max. Better than spending $180 plus PER JDM rotor having to be imported from Japan.

For the WRX owner. All youll need is the correct bolt pattern of rotor (usually a dual drilled setup on aftermarket rotors to begin with) And your E-Brake wont work.... few fixes for that... unfortunatly over $400 for special rotors for the Brembos or a little over $200 for special brake shoes that make the E-Brake work.

Ok so now what everyone is waiting for... the walk through.. its simple dont worry.

First after you have lined up the two cars to swap that are compatible. (I can personally confirm 05 STi and 07 WRX) all youll need to do is jack the car up in the front and take out the pads, unbolt the calipers and the brake line bolt.

If the Brembo mounting bolts come out hard like your cross threading thats normal... might have to get a timesert kit to fix it or you can use helicoil. (PM for details on that. Had to do that as well) after you get all bolts off...

THE STI ROTORS WILL FIT THE WRX as long as the bolt pattern is correct on the rotor. If not have a machine shop drill in the correct pattern and your good.

Important note THE WRX ROTORS WILL NOT FIT THE STI HUBS this is where the new rotors come in from Broken Motorsports.

fit the new rotors on and bolt up all swapped items on their new owners (STi Brembos and rotors on WRX and WRX calipers on STi with new DBA rotors)

Now to the rears... this is where things get questionable and tricky but hey this is what im here for... to make your life easier

do the same as the front obviously but youll notice something when you do this... the parking brake wont work on the WRX with STi rotors.... thats where the special rotors come in or different brake shoes... unfortunatly i dont have the info for that but i can find it and update. Also the dust plate on the WRX is touching??? thats ok take a hammer to that mother and bend it out of the way (not too much just a few mm to allow clearance) and problem solved. None of this needing to remove whatever and blah blah blah its really that damn easy.

after everything is mounted back up bleed the system and your good.

here are some problems i ran into and i made note of them at the top. WRX bend your rear dust plate back with a hammer... too easy. WRX will not have parking brake without special rotor or special spacer shoe. WRX make sure you have rims to clear brembos.

Any other questions please feel free to ask. This is my first write up and I hope I helped some people in their search for an answer on this.

If there is something missing please please please post something... i really want to help everyone and i dont want to leave anything out in case if forgot. i have all the information i can give about this so far i think.




Broken Motorsports DBA STi Group N (06-07 wrx) rotor
(201)442-0580
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Old 10-29-2013, 01:57 AM   #2
gregroot198521
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So you didn't use the brackets from Kartboy I keep hearing are needed on the rears?

Trying to put a 4/2 pot setup on an '06 STi soon, rather confirm what I need so I have it when I start.

Last edited by gregroot198521; 10-29-2013 at 04:36 AM.
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Old 10-29-2013, 04:56 PM   #3
Metalhead19d
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Originally Posted by gregroot198521 View Post
So you didn't use the brackets from Kartboy I keep hearing are needed on the rears? Trying to put a 4/2 pot setup on an '06 STi soon, rather confirm what I need so I have it when I start.
I just did this swap on my 05. You don't need any brackets. You will need rotors. Talk to broken Motorsports in NJ about their DBA rotors. They are specially made for this Sti with 4/2 setup. Calipers are direct bolt on though. I know this from personal experience.

I read about the brackets too but that's only needed for the 02-05 wrx models.
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Old 10-29-2013, 06:05 PM   #4
gregroot198521
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Quote:
Originally Posted by Metalhead19d View Post
I just did this swap on my 05. You don't need any brackets. You will need rotors. Talk to broken Motorsports in NJ about their DBA rotors. They are specially made for this Sti with 4/2 setup. Calipers are direct bolt on though. I know this from personal experience.

I read about the brackets too but that's only needed for the 02-05 wrx models.
Alright, well that's what I was finding in my research, I did double tap (triple, quadruple tap) the question elsewhere too, even with another '06 STi driver. Don't know of any differences in that aspect between the 05-07 STis though, so I'm thinking I'm safe not getting other brackets then. Appreciate the reply though!!

Yep, that's who I was planning on going through, been watching that Broken Motorsports thread for the DBAs on DI since it got started, seem like the best option out there, though I have been researching other options too (the gravel rotors most places sell, Adam's Rotors (pricing out a custom setup possibly), about all that seems available though), but when you toss in a stipulation of no dual drilled, those DBAs seem to be the only option that will match all requirements.

So far I have the 4/2 pot calipers and rebuild kits. Will take them apart, probably get them powder-coated when I'm back, still deciding color, and in the meantime I will source the best prices on everything else. Likely the rotors from Broken Motorsports, those uber-coated GoodRidge stainless steel brake lines (the ones with a black jacket over the steel braiding to keep abrasion from occurring) through Amazon (best price I found at least), and finally pads. Sorting through whether those Hawk HP+ or StopTech street performance are better, though those Ferodo DS2500s have my interest too. Choices, choices.
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Old 10-29-2013, 08:58 PM   #5
Metalhead19d
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Ya I went with the DBAs from broken. You can always have a machine shop customize them a little with slots or drills. For pads I'm just streeting around with some dura last ceramics (lifetime warrant, they wear out you get new ones free) and I'm going to look into getting some ebc blue stuff (sintered pad. Good cold bite all the way through to race conditions) and once I get those I'll update on how they feel. Make sure to keep at least one old break pad so you know what to show autozone because they have two different vehicle codes for the 06-07 wrx. One has your typical sliding caliper style pad and the other is the baby brembo style wich isy term for the 4/2 pot pad.

Btw all four rotors are 460 plus shipping. Not bad I think. And they are a sure thing. They got me all the way from Washington state to Texas.
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Old 10-30-2013, 07:20 AM   #6
gregroot198521
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Quote:
Originally Posted by Metalhead19d View Post
Ya I went with the DBAs from broken. You can always have a machine shop customize them a little with slots or drills. For pads I'm just streeting around with some dura last ceramics (lifetime warrant, they wear out you get new ones free) and I'm going to look into getting some ebc blue stuff (sintered pad. Good cold bite all the way through to race conditions) and once I get those I'll update on how they feel. Make sure to keep at least one old break pad so you know what to show autozone because they have two different vehicle codes for the 06-07 wrx. One has your typical sliding caliper style pad and the other is the baby brembo style wich isy term for the 4/2 pot pad.

Btw all four rotors are 460 plus shipping. Not bad I think. And they are a sure thing. They got me all the way from Washington state to Texas.
Yep, already knew the price, think I heard ~$60 for shipping, which reminds me that I didn't get that promised shipping quote. I have considered getting a customized setup, but I'm sure the blank face will be just fine for me.

I'll have to look into the pads dilemma a bit more. Good idea on keeping the old ones for an example, though I'll probably just buy them online anyways, don't have to deal with general levels of idiocy I usually find in the auto parts stores.
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Old 10-30-2013, 11:44 PM   #7
Metalhead19d
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Originally Posted by gregroot198521 View Post
Yep, already knew the price, think I heard ~$60 for shipping, which reminds me that I didn't get that promised shipping quote. I have considered getting a customized setup, but I'm sure the blank face will be just fine for me. I'll have to look into the pads dilemma a bit more. Good idea on keeping the old ones for an example, though I'll probably just buy them online anyways, don't have to deal with general levels of idiocy I usually find in the auto parts stores.
I didn't have much of a problem. Just about 15 minutes of finding the right pads. Great for street. The squeak a bit when warm (weird) but they stop good.

And the reason I say broken is because the guy invested $20k of his own money to get those rotors built for people like us. From a business standpoint I appreciate the effort and would continue to buy my rotors from them as I plan to open my own shop and understand the financial sacrifices it takes to make said business succeed. With that being said I'll give back to the noble business owner and support them with their investment for what is right for this situation.
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Old 10-31-2013, 02:23 AM   #8
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I didn't have much of a problem. Just about 15 minutes of finding the right pads. Great for street. The squeak a bit when warm (weird) but they stop good.

And the reason I say broken is because the guy invested $20k of his own money to get those rotors built for people like us. From a business standpoint I appreciate the effort and would continue to buy my rotors from them as I plan to open my own shop and understand the financial sacrifices it takes to make said business succeed. With that being said I'll give back to the noble business owner and support them with their investment for what is right for this situation.
Definitely planning on the rotors from Broken, I was talking about the machining aspect, which will mean either finding a worthwhile shop in El Paso or shipping them out to a reputable place.

I'm thinking I may just go for those StopTech ones, if they aren't good enough I'll upgrade on the next sets. Probably skip Hawk HPS and go with Hawk HP+, or go to some I've also heard good things about, the Ferodo DS2500s. I still have a number of months to make a decision though.
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Old 11-02-2013, 02:56 PM   #9
Metalhead19d
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Quote:
Originally Posted by gregroot198521 View Post
Definitely planning on the rotors from Broken, I was talking about the machining aspect, which will mean either finding a worthwhile shop in El Paso or shipping them out to a reputable place. I'm thinking I may just go for those StopTech ones, if they aren't good enough I'll upgrade on the next sets. Probably skip Hawk HPS and go with Hawk HP+, or go to some I've also heard good things about, the Ferodo DS2500s. I still have a number of months to make a decision though.
Hell I'm over in houston and I'll be going to the school of automotive machinists and they have two different CNC machines. I could talk to some current students and see of they can do it. I'll be taking the class but that won't be for at least a year.
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Old 11-06-2013, 09:21 PM   #10
mariolefty1
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Does anyone know the part number for the wrx limited 2006-2007 caliper piston? Do they even offer that?
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Old 11-09-2013, 07:24 PM   #11
Metalhead19d
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Originally Posted by mariolefty1 View Post
Does anyone know the part number for the wrx limited 2006-2007 caliper piston? Do they even offer that?
You may have to invest in a new caliper. Would probably be cheaper in the end and more reliable.
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Old 11-10-2013, 11:08 AM   #12
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Quote:
Originally Posted by mariolefty1 View Post
Does anyone know the part number for the wrx limited 2006-2007 caliper piston? Do they even offer that?
2006-2007 Impreza: WRX-TR, WRX, WRX Limited, Sedan or Wagon; all the same

Front caliper piston seal kit: 26297FA050 (alternate: 26297FA051)

Front caliper piston: 26236FA010

Rear caliper piston seal kit: 26697FA000

Rear caliper piston: 26635FE010
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Old 01-24-2014, 09:46 AM   #13
CurtisR401
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Where can I get the special spacer shoe to put rear brembos on a 07 wrx??? I Can't find them. Please Help! I want my e-brake to work.
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Old 01-24-2014, 10:39 AM   #14
Craig4g63
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http://www.knsbrakes.com/c/caliper-i...s+-+For+Legacy

Should be that. You can always contact them to verify.
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Old 01-24-2014, 04:39 PM   #15
CurtisR401
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Thanks Craig!!!
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Old 01-24-2014, 05:06 PM   #16
CurtisR401
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I contacted them. They are having issues with the fitment on WRX's. That's why they are listed for the Legacy. They are working on the issue and it should be fixed in a few weeks!
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Old 03-27-2014, 10:55 AM   #17
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I contacted them. They are having issues with the fitment on WRX's. That's why they are listed for the Legacy. They are working on the issue and it should be fixed in a few weeks!
KNS Breaks has fixed the issue with the e-brake shoes for impreza models. I just ordered my set and they are now available if you call them. $208 shipped
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