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Subject: "Interesting find on the GSX front brake upgrade...rotor size.."

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XtremeRS	Jun-04-04 08:05 AM
Member since May 20th 2003 6329 posts,

#24238, "Interesting find on the GSX front brake upgrade...rotor size.."
Jun-04-04 08:06 AM by XtremeRS

Ok, this is pretty messed up...I got the dual piston GSX front calipers, and rotors for a 98 GSX. Got it all bolted up, and the rotors were not the right size..they were *around* 1/16" wider, and the same smaller in diameter..(the rotor actually just barely touches the caliper bracket and pad shims) Checked the rotor part#'s with almost every manufacturer out there, including the dealer..Found out that from 95-97, is one rotor part#, and 98-99 is the other rotor part#, both for GSX AWD fronts..The strange thing is, all the part#'s for loaded calipers are IDENTICAL for 95-99..I just don't get it..So I ended up just getting the rotors for 95-97, and fit just perfectly..Anyone know the difference from 97 to 98+?? The ONLY thing i can think of is that the caliper brackets are diff on the 98+, but that still doesnt explain why all the loaded caliper#'s are the same throughout the years...Am I missing something here? haha..BTW, these brakes are sweet

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

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WickedESi	Jun-04-04 08:20 AM
Donating 2GNT member 3090 posts,

#24241, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 0

Umm...

I think I might be in the same situation.

There isn't enough space in mine to turn the rotor all the way around w/o the shims rubbing, but I thought it was only because I haven't bolted up my wheel yet (since part of it clears).

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

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XtremeRS	Jun-04-04 08:29 AM
Member since May 20th 2003 6329 posts,

#24242, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 1

Originally posted by WickedESi
Umm... I think I might be in the same situation. There isn't enough space in mine to turn the rotor all the way around w/o the shims rubbing, but I thought it was only because I haven't bolted up my wheel yet (since part of it clears).

Yeah man, just use a few wheel lugs to tighten down the rotor with the wheel off, and check it..You should have around 1/8" of clearance from each side of the bracket to the rotor..also, if your pads stick up like 1/16" or so from the rotor, then you have the wrong rotors. Or take the easy way out ,and measure the thickness of your rotor..If its 1" thick, its the WRONG one. Check the mimium thickness nuber on the rotor, its either onthe hub of it, or the backside of it..If it says more than .88 inches, then its the wrong one..

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turbo8u	Jun-04-04 08:58 AM
Member since Jun 15th 2003 10552 posts,

#24243, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 2

/me bookmarks this thread

good stuff matt

_ _ _ _ _ _ _ _ _

96 Black ESi
91 Red TSI AWD (RIP)
02 WRX

"turnin wrenches for nine hours in the pouring rain, just to get the beast up and running again"

Aerospace Certified TIG welder for Precision Castparts in Portland, OR.

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coppereclipse95	Jun-04-04 10:51 AM
Member since Apr 29th 2002 1068 posts,

#24245, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 0

Hey, this is the spooled...(dave) something dudes brake kit right? Got any pics? So, if I was to get a set, I need the 95-97 rotors?

1995 Eclipse RS

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WickedESi	Jun-04-04 11:22 AM
Donating 2GNT member 3090 posts,

#24246, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 4

My calipers/brackets were from gilee.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

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XtremeRS	Jun-04-04 12:32 PM
Member since May 20th 2003 6329 posts,

#24247, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 5
Jun-04-04 12:35 PM by XtremeRS

Yes, these were from Dave(spooledupracing), but let me just clarify, that this was NOT his fault whatso ever..If anything, its mine i guess, because I just told him to get the parts for a 98, since at the time, I was unaware of any differences in the rotors. Also, this does NOT pertain to the calipers or brackets! So far, this is just a rotor issue, as it seems like most loaded calipers you buy are all the same thing, its just that you need 95-97 AWD rotors to fit inside the caliper bracket properly. I'd still like to know the differences in the 98+ setup..

I just dont know how nobody knew of this yet really..I mean, lots of people have done this upgrade, and as far as I know, i have not heard of any rotor size issues..maybe its just that nobody yet has oredered rotors for a 98+ yet?? Or maybe people do know, and have mentioned it in the past, but i never saw it..

One more thing. Dave only shipped one pair of the rotors to a member, and he was contacted already about the issue. One more set of rotors had been ordered, but not yet shipped, so Dave now knows the exact part# that is needed. Of course, the proper rotors are quite a bit more expensive(accross the board between all brands really)..I paid 50.00 or so per rotor at Napa, and I got a good price on it at that..didn't really have time to shop around or special order, since i needed the car..

But this setup is awsome, I can already tell a huge difference in stopping power, even without the pads fully seated yet..

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WickedESi	Jun-04-04 12:48 PM
Donating 2GNT member 3090 posts,

#24248, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 6
Jun-04-04 12:50 PM by WickedESi

Ok. So when I tried rotating my rotor the first time it was w/ brand new Brembo slotted rotors. I had 2 opposing lugnuts on it just to hold the rotor flat, but that wasn't enough. Once I put the rest of the lugs on I have enough clearance to look all the way down on both side of the pads (and they are even). I'm willing to bet it's only slightly more than 1/16", I don't have any feeler gauges so I can't tell for sure.

Now on my Brembo's it says 22.4mm (.896") MIN thickness, but Brembo (and other performance rotors) make their performance rotors thicker than stock, which would make the clearances tighter.

So, in other words, my rotors work, and it contraverses some of the things you said.

What's wrong w/ a 1/16" clearance? I doubt they would expand 1/8" (2 x 1/16") under load.

It's possible they just used a tighter clearance on 98+ to take advantage of wider rotor. Why else would they not have 2 part numbers for the calipers?

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

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XtremeRS	Jun-04-04 01:02 PM
Member since May 20th 2003 6329 posts,

#24249, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 7

Originally posted by WickedESi
Ok. So when I tried rotating my rotor the first time it was w/ brand new Brembo slotted rotors. I had 2 opposing lugnuts on it just to hold the rotor flat, but that wasn't enough. Once I put the rest of the lugs on I have enough clearance to look all the way down on both side of the pads (and they are even). I'm willing to bet it's only slightly more than 1/16", I don't have any feeler gauges so I can't tell for sure. Now on my Brembo's it says 22.4mm (.896") MIN thickness, but Brembo (and other performance rotors) make their performance rotors thicker than stock, which would make the clearances tighter. So, in other words, my rotors work, and it contraverses some of the things you said. What's wrong w/ a 1/16" clearance? I doubt they would expand 1/8" (2 x 1/16") under load. It's possible they just used a tighter clearance on 98+ to take advantage of wider rotor. Why else would they not have 2 part numbers for the calipers?

Well, let me tell you this. I tried to use the 98+ rotors...I put them on, and the pad reataining clips were rubbing the rotor, and the rotor was pretty much touching the bracket, but ONLY on the outside of it, there was a greater gap on the inside of the bracket..Thats just not right. The rotor should have equal clearance as it sits in the braket..I actually drove the car with it like this, and noticed right away a rubbing noise. Should have known right there, but a few hard stops later, and it looked like my front end was on fire..billows of smoke out of the brakes! I've done tons of brake jobs on all kinds of cars, and not once have i seen a rotor come that close to the bracket, or pads that overhang the edge of the rotor by 1/16".. As for no 2 part#'s for calipers, i have no clue..At this point, i'm still baffled by it..all I know, is that those 98+ rotors did NOT work right at all..

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WickedESi	Jun-04-04 01:05 PM
Donating 2GNT member 3090 posts,

#24251, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 8
Jun-04-04 01:05 PM by WickedESi

Since I have an equal distance on the inside, and outside of the rotor, you think it would be safe to test, agreed?

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

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XtremeRS	Jun-04-04 01:23 PM
Member since May 20th 2003 6329 posts,

#24253, "RE: Interesting find on the GSX front brake upgrade...rotor size.."
In response to Reply # 9

Originally posted by WickedESi
Since I have an equal distance on the inside, and outside of the rotor, you think it would be safe to test, agreed?

If its not rubbing anything, then i say its fine...

Now this is really messed up..I called the dealer, and the part#'s for the caliper/bracket assembly is IDENTICAL from a 97 to a 98...same knuckles, same hubs, BUT he did say the pads were a diff part#, but I can't see how that will effect how the rotor sits in relation to the caliper bracket thats bolted to the knuckle..man this is just strange..How in the hell that 98+ rotor fits in these caliper brakets, I have no clue..its not like its an invovled operation to put them on or anything haha..

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