Why is everyone looking for a rear brake kit?

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Jan 29, 2004 | 12:58 PM

#91

KGB

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Joined: Nov 2002

Posts: 99

From: Delta, BC, Canada

Car Info: 2000 Impreza 2.5RS BRP

Interesting reading this all over again - I didn't check how many GC/GMs are here, but me upgrading from stock RS brakes to 4pots + WRX rotors up front sure shifted the bias forward with quite a heavy dive - for all I know, the 4pots reduce the bias in the front, but the rotors jacked it way back up, for a MY00 RS. Now granted, I don't see a need for the STi 2 pots in the rear either, but I definitely see a need for the H6 rotors in the back to balance things out a bit (plus a more aggressive pad that works cold). How would this combo work on a MY00 RS then - STi 4 pots, slotted WRX rotors, STi pads in front, H6 rotors (might not go slotted) and aggressive street pad in the back?

Jan 29, 2004 | 01:05 PM

#92

KGB

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Joined: Nov 2002

Posts: 99

From: Delta, BC, Canada

Car Info: 2000 Impreza 2.5RS BRP

A question more to the point would be how well the whole system works on the street with 4 pots up front and 1 pot in the rear, and up-sized rotors all around?

Feb 13, 2004 | 10:35 PM

#93

Kobayashi

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Quote:

Originally posted by KGB
Interesting reading this all over again - I didn't check how many GC/GMs are here, but me upgrading from stock RS brakes to 4pots + WRX rotors up front sure shifted the bias forward with quite a heavy dive - for all I know, the 4pots reduce the bias in the front, but the rotors jacked it way back up, for a MY00 RS. Now granted, I don't see a need for the STi 2 pots in the rear either, but I definitely see a need for the H6 rotors in the back to balance things out a bit (plus a more aggressive pad that works cold). How would this combo work on a MY00 RS then - STi 4 pots, slotted WRX rotors, STi pads in front, H6 rotors (might not go slotted) and aggressive street pad in the back?

I am glad this thread gets bumped up every once in a while, great info from a lot of people in this thread.

Interestingly the STi 4pots actually drop front brake torque slightly when compared to the stock RS brakes.

k.

edit: I am assuming equal pad material. The 4pot pads could be more aggressive, accounting for your increased dive.

Last edited by Kobayashi; Feb 13, 2004 at 10:39 PM.

Feb 16, 2004 | 12:11 PM

#94

KGB

Registered User

Joined: Nov 2002

Posts: 99

From: Delta, BC, Canada

Car Info: 2000 Impreza 2.5RS BRP

I doubt it dropped brake torque on mine - I have an MY00 and it certainly dives more now with the 4 pots and WRX rotors than with the 2 pots and stock RS rotors. That's why I'm wondering if I should do anything in the rear to even it out, the least is to upgrade to H6 rotors I figure...

Feb 17, 2004 | 06:48 AM

#95

Kobayashi

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Quote:

Originally posted by KGB
I doubt it dropped brake torque on mine - I have an MY00 and it certainly dives more now with the 4 pots and WRX rotors than with the 2 pots and stock RS rotors. That's why I'm wondering if I should do anything in the rear to even it out, the least is to upgrade to H6 rotors I figure...

Well if you exclude the new pad's coefficient of friction, there is nothing to doubt. You cant change the laws of physics. But inherent drop is slight(-3% IIRC) so it could have easily been overcome by more aggressive pads.

Without a doubt, I think you would be pleased with an H6 rear upgrade. Your car and mine start with essentially the same brake setup. I am running the STi(non-Brembo) 4pot fronts and the B4/GT-B rear and its a nice total effect.

k.

Mar 28, 2004 | 01:08 AM

#96

silentbob343

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Joined: Mar 2004

Posts: 302

From: bah

Car Info: POS

quick question

Why do people upgrade to WRX fronts, 277mm rotor, and H6 rotors in the rear, 290mm? Shouldn't the front rotor be larger to keep proper brake bias? Excuse me for me ignorance on this topic.

Whoops sorry, 294mm makes more sense.

Last edited by silentbob343; Apr 1, 2005 at 08:24 PM.

Mar 30, 2004 | 07:34 AM

#97

Kobayashi

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Quote:

Originally posted by silentbob343
quick question

Why do people upgrade to WRX fronts, 277mm rotor, and H6 rotors in the rear, 290mm? Shouldn't the front rotor be larger to keep proper brake bias? Excuse me for me ignorance on this topic.

The WRX fronts are 294x24mm, the RS fronts are 277x24mm. The only people that 277mm would be an upgrade for would be people using the single pot/260x24mm front brakes.

You have to assess bias based on what brakes are on the vehicle to start with. The RS going up to an "H6" and leaving the fronts stock would be a good bias upgrade. The WRX again leaving the fronts stock and going up to the "H6" would be a good bias upgrade.

The advantage to the "H6" is upping the rear brake torque output to help include the rear brakes a little more in the braking process. You have to assess bias changes in their totatlity tho, meaning what did you start with and what are you going to in the front and rear.

Both effective disc diameter and total caliper piston area are the keys to figuring the ultimate brake torque.

k.

Apr 5, 2004 | 06:20 PM

#98

wagandreams

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I don't know if anyone has read the thread about stoptech, But if there is no need for a rear brake kit with stop-tech brakes why would the company be coming out with a new big brake kit for the rear of wrxs?

Apr 6, 2004 | 09:29 PM

#99

Lowball

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Posts: 2,144

From: Propr!

Car Info: 02Wag on 17's

Quote:

Originally posted by wagandreams
I don't know if anyone has read the thread about stoptech, But if there is no need for a rear brake kit with stop-tech brakes why would the company be coming out with a new big brake kit for the rear of wrxs?

I think because people keep asking for one. It's not needed but people will buy it just because it looks good. I know it sounds dumb but I would strongly consider getting a set of rears just to match my fronts. And if it gives me a bit better braking in the process then cool.

But like many have said, including stoptech, it's not really needed because the fronts are doing most of the work to stop the car.

Apr 7, 2004 | 05:38 AM

#100

Ace

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I just thought I would throw a bump in for the carbotech bobcats... not because I think they stop all that much harder than other aftermarket street pads.. but because they dust less than any other strret pad (assuming you dont have slotted or drilled rotors) with aftermarket stopage...

I hate cleaning wheels!

Greg
ace@inreach.com