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Old 03-05-2003, 12:57 PM   #1
Craig W
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Default stock WRX vs RS calipers/pads

Hey all,

I did some searching, but didn't find anything on this. I have a GC8 and I'm considering the WRX/H6 brake rotor swap. From the threads I've read on this, it sounds like the stock calipers are the same for the WRX and RS. Is this true? If so, why do they list different brake pads for the WRX vs the RS? Is it a different/ higher performance compound?

Or is it just the rears that are the same? If that's the case, wouldn't just changing the front rotors give you similar brake distribution to a stock WRX, and therefore the H6 rear rotor swap wouldn't be necessary, like some of the threads have stated?

Thanks for any info.

Craig W
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Old 03-05-2003, 02:08 PM   #2
Jack
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Having done the H6 rear size swap on my 4potted front RS, I can tell you:

Stock calipers and pads are the same front and rear between them all.

Rotor size starts at RS, gets bigger for WRX, gets bigger for OBW LTD through all H6 in the rear. And caliper bracket as well.

All will fit all, with removal of rear backing plate (3 easy spot welds). I swapped my wife's OBW LTD rear with my RS rear and just swapped back (trading the car in).

I do at least 10 track days a year and do have brake fluid boiling problems, thus any "free" brake upgrade is gladly used. If you don't have similar issues, spending any money on this is silly.

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Old 03-05-2003, 02:17 PM   #3
elgorey
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FYI, 03 WRX and 02 RS use a different caliper and slightly different shaped pad.

all other years front calipers are the same, and rear calipers are all the same, except for 98 RS which had a different rear caliper.
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Old 03-05-2003, 06:39 PM   #4
Kristopher
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I love coming onto the forums and looking for information and finding exactly what it was I was looking for. More often then not it seems there is a lot of useless jibber.

Anyway... I had this same question in mind. I was wondering if the 2.5RS pad were the same as the WRX. This is very good news. I had ordered a brake upgrade kit for the rear and it used RS rear shaped pad(long story finding that info out). The deal fell through and I had oredered some carbon/kevlar pads to fit this new setup. I was bumming because I had ordered the brake kit seperately, i.e. different company, from the pads and wasn't sure if these pads were going to work with my stock WRX caliper.

YEAH!

-Kris
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Old 03-05-2003, 06:52 PM   #5
Craig W
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If they're the same, why are the pads for the WRX more expensive than for the RS? Different material?
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Old 03-05-2003, 08:20 PM   #6
Kristopher
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Good question, Craig. Iwould guess that the pad material is probably of a different compound, higher heat, to be able to compensate for the higher performance level of the WRX. Has anyone actually priced the difference? I dont tend to order factory parts when it comes to consumables like this.

I will say this... I have the Wilwood/Perrin front brake kit. My front pads for that are less expensive then the rear of the stock size, same pad compound. I speculate because they only need to make one pad shape for a Wilwood four piston vs. the various shapes of the different oem brakes.

Sorry that does not shed any light on the subject.

-Kris
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Old 03-05-2003, 08:51 PM   #7
Craig W
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The price difference I saw on SubaruWRXParts.com was, like $8. Not that big a deal.

The reason I was considering going back to the OEM pads was because I only do 1-3 track days per year. And I had stock brakes for several track days w/ no fade problems. Granted I never really did any serious threshold braking. Later, I upgraded to EBC Greenstuff pads. They were nice for the one track day I went to w/ the pads. But I still boiled my brake fluid. After that, they were fine for the next 12k miles, but now I've got pad material buildup on the discs causing shuddering at medium+ braking and squealing during light braking.

I know I could just get the rotors resurfaced again, but from what I've read, once the cementite buildup starts, the shuddering can return easily. Any opinions on what to do?
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Old 03-05-2003, 08:52 PM   #8
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Quote:
Originally posted by Craig W
If they're the same, why are the pads for the WRX more expensive than for the RS? Different material?
Craig...

'97 - '02 WRX/RS uses the same front pads (http://www.subydude.com/parts/details.php?55)

'03 RS/WRX uses a different set of front pads
(http://www.subydude.com/parts/details.php?53)

both uses the same rear pads.

they are the same material...

why they are priced differently? --- as a vendor i get charged more from the manufacturer.

SD
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Old 03-05-2003, 08:55 PM   #9
Craig W
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Thanks Suby_Dude.
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Old 03-05-2003, 09:15 PM   #10
Kristopher
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Quote:
Originally posted by Craig W
The reason I was considering going back to the OEM pads was because I only do 1-3 track days per year. And I had stock brakes for several track days w/ no fade problems. Granted I never really did any serious threshold braking. Later, I upgraded to EBC Greenstuff pads. They were nice for the one track day I went to w/ the pads. But I still boiled my brake fluid. After that, they were fine for the next 12k miles, but now I've got pad material buildup on the discs causing shuddering at medium+ braking and squealing during light braking.

I know I could just get the rotors resurfaced again, but from what I've read, once the cementite buildup starts, the shuddering can return easily. Any opinions on what to do?
Craig,

I would suggest getting a better pad if you have a build up on the rotor from a track session. I had the same thing happen to me with the stock pads. You don't need to resurface, just take some medium grit sandpaper and sand off the old pad. Put the rotors back on... nearly good as new.

If you are boiling brake fluid and "cooking" pads I would suggest that you are braking pretty heavily, just at the limit of what came stock with your car or otherwise. You simply found out what the limits are for what you had. Fade definately was happening if you boiled fluid and have pad build up on your rotors.

I, unlike others, am not a fan of the EBC stuff. I have not personally tried them... don't need to. Stories like this tell me enough. I am a fan of the Hawk pads. I am about to try a different company, sorry I dont remember the name, and these are a carbon/kevlar compound that came recommended by a local race shop. FYI, these are not full on race pads. The company makes different compunds and this is the equivelant to Hawk HP+, only a little better. The better being 1. not the dust associated with the Hawks 2. longer lasting.

Just my $.02

-Kris
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Old 03-05-2003, 09:23 PM   #11
Siper2
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Porterfield R4-S pads all around, for me. Got them about six months ago. Really nice, quite grabby.

I'd like to do the WRX front rotor/caliper bracket upgrade at some point, but that'd necessitate the sale of my 15" winter wheels and at this juncture I can't afford a whole lot of new stuff, so I'll be keeping my setup for now.

I do have new front rotors from FrozenRotors.com but they're OEM-size. They're cryo-treated Brembo discs (no cross-drilling or slotting, I'm not in to that).

-S2-
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Old 03-05-2003, 09:25 PM   #12
Craig W
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Thanks for the advice, Kristopher. So you don't think I need to do anything to remove the build-up on the rotors? Just sand the pads a bit? That would be easier. I suppose it wouldn't hurt to try this first before buying a bunch of new parts.
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Old 03-05-2003, 09:30 PM   #13
Kristopher
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Craig,

Sorry, I meant sanding the rotor. But actually sanding both can help. Sanding the rotor will remove all of the old material that got "glued" by the extreme heat. Sanding the pad will help remove any glazing that occured from the extreme heat.

Siper2,

Have you used the Porterfields at the track? Also how much were your rotors from Frozen Rotors?

-Kris
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Old 03-05-2003, 11:06 PM   #14
elgorey
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Quote:
Originally posted by suby_dude

'97 - '02 WRX/RS uses the same front pads (http://www.subydude.com/parts/details.php?55)

'03 RS/WRX uses a different set of front pads
(http://www.subydude.com/parts/details.php?53)
SubyDude, you need to change that first line to
'97-'02 WRX and 98-01 RS uses the same front pads.
and 2nd line to
'03 WRX and '02/'03 RS

as I already mentioned, the '02 RS uses the same pad as the '03 WRX

misinformation is a bitch
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Old 03-05-2003, 11:10 PM   #15
suby_dude
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Quote:
Originally posted by elgorey


SubyDude, you need to change that first line to
'97-'02 WRX and 98-01 RS uses the same front pads.
and 2nd line to
'03 WRX and '02/'03 RS

as I already mentioned, the '02 RS uses the same pad as the '03 WRX

misinformation is a bitch

oh ok... i'll pass that on to carbotech folks.

thx.

SD
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Old 03-05-2003, 11:32 PM   #16
elgorey
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hrm, Carbotech should know that. In fact Larry was one of the first people to spot this discrepancy. I talked to him about it on the phone about it a long time ago. ah well.
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Old 03-06-2003, 08:34 AM   #17
Jack
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Quote:
Originally posted by Craig W
If they're the same, why are the pads for the WRX more expensive than for the RS? Different material?
I can't say for sure, but it could simply be marketing. Why are subie 4 pot pads over $100, when I bought mine for a 300ZX TT (same pad) for $21.99? Subie 4-pots are exotic, but 300ZX TT are pretty generic......marketing.

jack
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