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Old 03-15-2004, 08:23 PM   #1
Unabomber
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Your NASIOC Administrator H-6 brake upgrade for dummies

There has been some local interest in this and I though I would post here for those in Hampton Roads/Mid-A. The H-6 brake upgrade is probably the cheapest brake upgrade out there. It involves swapping out the rear brakes on a WRX/RS with the rear brakes on a 2000+ Outback. The new brake rotors will end up being about an inch bigger than stock.

Here is what you will/may need:

26696AE020: $84.95 WRX rear brake pad kit (need one)
26625AE000: $54.12 Outback rear caliper bracket (need two)
26700AE04A: $66.36 Outback rear rotor (need two)

You might be able to skip item one depending on the condition of your pads. It is always "best" to replace them at the time of rotor replacement though.

Alternate rotors: view this thread.
Cheaper metod: http://forums.nasioc.com/forums/show....php?t=1824687

How to do it

Perry Subaru Discount for the above listed prices. Perry will ship to your location as well, or you can get these parts from another source. The prices listed are 20% off retail.

*****04 users have to use 03 pads in order for this to work properly. Thread with details

-Team Cheapskate

Last edited by Unabomber; 02-23-2014 at 06:55 PM. Reason: updated pad number/price
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Old 03-15-2004, 10:09 PM   #2
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Very tempting Ron! Don't make me do it. I want to see it in person first though. I also need to make some more money, but brake upgrades should be done soon.
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Old 03-15-2004, 10:24 PM   #3
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that is great info!
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Old 03-16-2004, 02:17 AM   #4
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I'd like to join 'Team Cheapskate'.
Where can I find a signup form?

- Janq
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Old 03-16-2004, 06:33 AM   #5
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doing this swap should be even easier than doing the 4pot fronts. About an hour including brake bleed.
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Old 03-16-2004, 07:07 AM   #6
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Wow! That's the best how-to I've seen yet. Peaty is the shizznit.
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Old 03-16-2004, 10:01 AM   #7
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Sounds like a good thing to do when the pads are worn. When it comes time I think I will consider this.
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Old 03-16-2004, 12:11 PM   #8
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Im actually doing this upgrade this weekend, although I am using DBA 657 rotors instead of OEM ones. Plus according to DBA they say not to do rotors and pads at the same time if you don't have to, so I will do my pads a week later.
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Old 03-16-2004, 03:36 PM   #9
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Please post here with your results. If the money Gods shine down on me, I will be doing the same in a month or so. I hope it's as easy as the walkthough makes it out to be. It's a sad day when I do anything other than a power mod.

Power is nothing without power.

-teh Unabomber
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Old 03-16-2004, 05:53 PM   #10
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good thing you aren't going to use the H6 rears with the 4 pots up front...that would give you a rear braking bias big time!!!
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Old 02-11-2006, 02:43 PM   #11
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Quote:
Originally Posted by Homemade WRX
good thing you aren't going to use the H6 rears with the 4 pots up front...that would give you a rear braking bias big time!!!
I see in this thread, this combination (H6 + 4-pot) is discussed in detail with the consensus being that the brake bias will be negatively impacted(?). Iíve also seen this same point discussed elsewhere.

Contradicting to this, I see in other threads that reputable guruís are saying the exact opposite, and Iím very confusedÖ I would like to run a similar setup consisting of JDM 4-pots and H6 rears but itís very unclear if the bias will be negatively impacted???

For example, from THIS thread:

Quote:
Originally Posted by Davenow
...IMHO the best brake setup for any non STI imprezza is 4 pots up front, the Legacy upgrade in the back, and stainless lines. I ALMOST liked the braking in my WRX with that setup better than my STI. Its that good.
~Anybody know if this setup will work?

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Old 02-11-2006, 05:17 PM   #12
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Quote:
Originally Posted by xcntrk75
I see in this thread, this combination (H6 + 4-pot) is discussed in detail with the consensus being that the brake bias will be negatively impacted(?). Iíve also seen this same point discussed elsewhere.
don't hold my statement true, I had not run the numbers and was only repeating what I had been told (dumb)...I can however run the numbers in my brake torque spreadsheet if I can get effective braking diameters or the rotors, piston sizes, and number of pistons...I will set the pads coefficient of friction equal so we just see the torque produced by the caliper and rotor...
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Old 02-11-2006, 07:41 PM   #13
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Quote:
Originally Posted by xcntrk75
...~Anybody know if this setup will work?

Tim ran Stoptechs up front (much like the 4-pots they decrease front brake torque, smaller piston area IIRC) , and Legacy GT rears (big and vented) for a while and was totally happy with it, even at the track. Just from my brief time with Stoptechs + H6 rears (including bedding them in) I don't feel at all like the car is too loose/rear biased.

One other thing is you can always run more aggressive pads up front than in the rear if you're too worried about it. If I was tracking my setup, that's probably what I would do. *eyes Tim's leftover track pads*

john
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Old 02-11-2006, 08:01 PM   #14
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Quote:
Originally Posted by ButtDyno
Tim ran Stoptechs up front (much like the 4-pots they decrease front brake torque, smaller piston area IIRC) , and Legacy GT rears (big and vented) for a while and was totally happy with it, even at the track. Just from my brief time with Stoptechs + H6 rears (including bedding them in) I don't feel at all like the car is too loose/rear biased.

One other thing is you can always run more aggressive pads up front than in the rear if you're too worried about it. If I was tracking my setup, that's probably what I would do. *eyes Tim's leftover track pads*

john
I want some dimensions...subie four pots, the sti brembos and the stoptech piston diameters...also the diameters of the rotors that go with each...
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Old 03-16-2004, 07:27 PM   #15
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do H6 front brakes work for imprezas?
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Old 03-16-2004, 07:31 PM   #16
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I think the WRX brakes are either the same or slightly bigger, so it's a moot point. Our only front upgrade is 4 pots or other crazy expensive options. Obviously, just a pad change is a huge upgrade alone over the OEMs. Pad change = brake dust city though.
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Old 03-16-2004, 07:32 PM   #17
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Quote:
...that would give you a rear braking bias big time!!!
Need to check on it, but I think nothing changes the brake bias unless you install a proportioning valve.

I'll get back to you.
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Old 03-16-2004, 07:35 PM   #18
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You and your proportioning valve. I actually saw a thread on that today. The "ghetto proportioning valve" is to use normal tires on the front and R compounds on the back. Apparently, it works rather well for people who want more rear bias. I don't know rear bias from a sandwich though.
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Old 03-16-2004, 07:48 PM   #19
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hey I'm just giving you a heads up of what a local wiring master and car know it all (in a good way) told me...he was speaking so fast about toruqe and stuff that he got me a little confused but imprinted on my mind that the H6 rears and 4 pot fronts were not good at all...or just gave big rear bias
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Old 03-16-2004, 07:53 PM   #20
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Wire God=Dunk
Slushee Machine Operator=Kent
Master of teh Bling=Regis
Large Frontal Bulge=teh Unabomber
Brake Master=.......we don't have one, so quit listening to Dunk.
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Old 03-16-2004, 09:04 PM   #21
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Quote:
Originally posted by Unabomber
Wire God=Dunk
Slushee Machine Operator=Kent
Master of teh Bling=Regis
Large Frontal Bulge=teh Unabomber
Brake Master=.......we don't have one, so quit listening to Dunk.
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Old 03-16-2004, 10:17 PM   #22
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Quote:
Wire God=Dunk
Slushee Machine Operator=Kent
Master of teh Bling=Regis
Large Frontal Bulge=teh Unabomber
unk
Uber Driver: Christian
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Old 03-16-2004, 10:19 PM   #23
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Quote:
Need to check on it, but I think nothing changes the brake bias unless you install a proportioning valve.
\

Wow . Let's start at the beginning. Braking Bias is determined by the difference between the front and rear braking power of the car. Brake torque and the grip of the tires are the two biggest factors determining braking performance.

Brake torque = line pressure x caliper piston arear x effective rotor radius x pad coefficient of friction.

Looking at the above equation the two easiest things we can do to change the braking bias front front to rear is to change the size of either the piston area or effective rotor radius. The H6 upgrade on the rear brakes of the impreza changes the latter, providing about a 10% shift in bias to the rear. The 4 pots do the opposite, decreasing the brake torque in the front.

As I'm being quoted above I thought I'd give the chance to explain myself. I didn't mean to say that doing the two together would be dangerous. However if you put both 4 pots in the front and the H6 rotors in the area, you have changed the braking bias quite significantly from the stock setup. These two could probably be used together quite successfully however you might have to be a little careful about pad choices.

Remember that neither the 4 pots nor the H6 rotors will significantly shorten your stopping distances. Go out with a stock WRX and slam on the brakes and the antilocks will engage. That shows you that you have sufficient brake torque to lock the wheels, and the reason you don't stop quicker is due to a lack of grip. Even with my stickier Yokohama tires in 225 width sizes full brake pedal at any speed would still result in antilock engangement.

So what we are really talking about is changing the balance. In my opinion, and take it for what it's worth, doing both 4 pots and H6 rotors would provide more rear bias than you would ever want on a street driven car.

Now, continue to keep discussing me behind my back

Duncan

Oh, and on a side note, my cars all back together

Last edited by dunk; 03-17-2004 at 07:34 PM.
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Old 03-16-2004, 10:20 PM   #24
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Quote:
Originally posted by PURE EPI
Uber Driver: Christian
Uber ego: christian



slammmmmmmmmm DUNK! ohhhhhhhhh
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Old 03-16-2004, 10:27 PM   #25
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Quote:
slammmmmmmmmm DUNK! ohhhhhhhhh
Ron and his damn hating

Duncan
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