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Old 02-10-2017, 10:35 AM   #1
moosecakes
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Default Rear BBK for 2007 WRX?

Are there any rear Big Brake Kits for the 2007 WRX (5x100) which retain the emergency brake?

All the BBKs I've seen delete the e brake.

Thanks!
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Old 02-10-2017, 11:32 AM   #2
Samurai Jack
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What BBKs are you looking at?

My guess is that they are telling you that the E-brake has to be eliminated because they are using the STi sized rear rotors ( 5x114.3 ), with a 5x100 bolt pattern which are too large to accommodate the normal 5x100 E-brake.

The E-brake drum size for the 5x100 is smaller than the 5x114.3 rotor.

There is a way to do this as long as you don't care if you have 2-pot rear calipers, and you still get 90% capacity of the 2-pots.

What you do is order the conversion rear rotors for the 5x100 ( available from DBA or KNS ( KNS brakes are KNS branded DBAs vs DBA branded ).
This will give you the STi sized rear rotors for the 5x100 E-brake.

Then, get the rear brake calipers from a 1994 non-Turbo Legacy.
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Old 02-10-2017, 02:23 PM   #3
jamal
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The wrx 2-pots provide more brake torque than almost any other set of rear brakes including the sti brembos so you are at least in a decent spot with the stock parts. So skip that sti brembos or the "oem brembo" kit that's available.

Stoptech's catalog is all wrong for the impreza. They list the same kit for 02-05, 06-07, and 08-14, which all have different fitment. Also no parking brake.

The wilwood kit for the 06-07 wrx looks like it has the right brackets and does include a park brake. That seems to be the only thing I can find that I think will work right now.

The other option I can come up with is to have a bracket made to adapt a caliper of your choice to something. Stoptech has some cool small 4-pots like the str-43, that with 26/30mm pistons and a kns/dba sti brembo rotor would work out ok.

Quote:
Originally Posted by Samurai Jack View Post
What you do is order the conversion rear rotors for the 5x100 ( available from DBA or KNS ( KNS brakes are KNS branded DBAs vs DBA branded ).
This will give you the STi sized rear rotors for the 5x100 E-brake.

Then, get the rear brake calipers from a 1994 non-Turbo Legacy.
How is that supposed to work? The 94 n/a legacy had smaller caliper pistons and a 266x10mm rotor. So the caliper will not even physically fit over an sti rotor even if you had some sort of a taller bracket.

Last edited by jamal; 02-10-2017 at 03:10 PM.
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Old 02-10-2017, 02:32 PM   #4
Samurai Jack
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Quote:
Originally Posted by jamal View Post
How is that supposed to work? The 94 n/a legacy had smaller caliper pistons and a 266x10mm rotor. So the caliper will not even physically fit over an sti rotor even if you had some sort of a taller bracket.
You get the calipers from the auto parts store. I used A1Cardone rebuilds.
You get the larger caliper brackets.
You use the 320mm x 20mm
You use the correct pads

Plug it all together and WHAMMO! It works.

I have the p/n's at home
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Old 02-10-2017, 03:43 PM   #5
jamal
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Sure you're not actually using 190mm rotors?

Either way, a 1-pot bracket isn't going to fit on an 07 wrx.
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Old 02-10-2017, 03:51 PM   #6
moosecakes
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Quote:
Originally Posted by jamal View Post
The wrx 2-pots provide more brake torque than almost any other set of rear brakes including the sti brembos so you are at least in a decent spot with the stock parts. So skip that sti brembos or the "oem brembo" kit that's available.

Stoptech's catalog is all wrong for the impreza. They list the same kit for 02-05, 06-07, and 08-14, which all have different fitment. Also no parking brake.

The wilwood kit for the 06-07 wrx looks like it has the right brackets and does include a park brake. That seems to be the only thing I can find that I think will work right now.

The other option I can come up with is to have a bracket made to adapt a caliper of your choice to something. Stoptech has some cool small 4-pots like the str-43, that with 26/30mm pistons and a kns/dba sti brembo rotor would work out ok.



How is that supposed to work? The 94 n/a legacy had smaller caliper pistons and a 266x10mm rotor. So the caliper will not even physically fit over an sti rotor even if you had some sort of a taller bracket.
I've got the stoptech 4 piston BBK ST-40 on the front so if I could do another stoptech kit in the rear that would be awesome!
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Old 02-10-2017, 04:53 PM   #7
jamal
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Problem is there are very few rotors out there that are bigger and maintain the parking brake. Say you have brackets made to adapt a stoptech caliper to a sti rotor, by then you might as well just use the oem brembos since they bolt right to the backing plate. That's probably your quickest, easiest, and cheapest option for a bigger rear brake (although they generate slightly less torque).

If you're going through the trouble of making brackets it would be nice if they used a bigger, possibly 2-piece rotor. So there's the wilwood kit. Or there's making brackets to use a stoptech caliper with a wilwood rotor.

They make this hat:
http://www.wilwood.com/Hats/HatProd....emno=170-12854

You could use whatever ring size you want. Something like 328x28. An st20 caliper with 36mm pistons would keep bias about right.

Other suggestions I would make are swapping to a 1 1/16" MC (they are on a lot of cars, 02-05 wrx, the sti for example). STI booster is looking like a good upgrade too.

Last edited by jamal; 02-10-2017 at 07:53 PM.
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Old 02-10-2017, 11:59 PM   #8
subaru3169
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mmmm i have st22s for the rear on mine, but then i have an 02 wrx

he could make that work if he wants to use the older wrx stuff
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Old 02-13-2017, 02:23 PM   #9
Samurai Jack
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Quote:
Originally Posted by jamal View Post
Sure you're not actually using 190mm rotors?

Either way, a 1-pot bracket isn't going to fit on an 07 wrx.
Absolutely
- 316mm x 20mm rear rotor
- 170mm parking brake

If it won't work on a 2007, then never mind
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Old 02-13-2017, 02:53 PM   #10
jamal
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What calipers and brackets?
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Old 02-14-2017, 12:05 AM   #11
Patrick Olsen
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Yeah, I'm still interested in knowing what combination of parts you're using, Samurai Jack. I've been thinking of the ATS Brembo setup up front, but would want to go bigger in the rear, too, to not throw the balance too far forward. If there's a way to mix and match OEM parts to get bigger rears I'd love to hear it!

As much as I hate to give them any exposure, RacingBrake has some caliper brackets for using bigger rotors with stock calipers. Look at the "OE Caliper Big Brake Kits" on their site.
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Old 02-14-2017, 12:35 AM   #12
jamal
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Hey Pat, the ATS calipers generate nearly the identacal brake torque as the 05+ Legacy GT front brakes.

So if you are talking about your BD Legacy, the fhi 2-pots are probably the best bet for the rear. Bias will only move only marginally forward, and your overall piston area stays the same. Until I hear more about this brembo rear rotor thing they are the highest torque option that bolts onto the pre-08 cars (newer cars can get tribeca brakes to work).
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Old 02-14-2017, 10:10 AM   #13
Samurai Jack
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Quote:
Originally Posted by Patrick Olsen View Post
Yeah, I'm still interested in knowing what combination of parts you're using, Samurai Jack. I've been thinking of the ATS Brembo setup up front, but would want to go bigger in the rear, too, to not throw the balance too far forward. If there's a way to mix and match OEM parts to get bigger rears I'd love to hear it!

As much as I hate to give them any exposure, RacingBrake has some caliper brackets for using bigger rotors with stock calipers. Look at the "OE Caliper Big Brake Kits" on their site.
Well, since you mentioned it:
http://www.racingbrake.com/LEGACY-RE...U-p/2123-k.htm

This is the kit I used to get set up originally.

I'm not very big on Racing Brake anymore because their Customer Service is just awful sometimes. All depends on who you get in contact with.

So, you will need these brackets:
http://www.racingbrake.com/Subaru-RE...1A-p/cb11a.htm
You could probably source them from Subaru

You will need these calipers:
90-94 LEGACY TURBO caliper, P/N 1415
I got mine through Advanced Auto
(Notice my confusion from earlier: The kit title says NON-TURBO but the calipers say TURBO)

And you will need the appropriate sized pads: PD471

For rotors, you can use the DBA conversion rotors to keep the 170mm e-brake OR

KNS has the exact same rotor made by DBA for less than DBA.

I think of this upgrade as the H6 Upgrade on Steroids
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