GXP Brake upgrade [Archive] - GRRRR8.net

G8V8

08-13-2008, 09:01 AM

I just e-mailed a friend in the industry who told me he was going to put together a GXP brake kit for the G8GT once he has pricing. He has access to all the parts books and compares the part numbers of the 2 systems to see what is the same (knuckles?) and what is different. Hopefully he will have some answers that might help.

GRRRR8

08-13-2008, 09:03 AM

You are the man Ed! I know a lot of people want to know.

Chewy

08-13-2008, 09:18 AM

Hell yeah! That's an awesome deal! I would just like the front rotors and calipers or just the calipers if the rotors are the same.

That'd still be stupid expensive and not worth it for me as I am not road racing it.

GRRRR8

08-13-2008, 09:51 AM

Pimpin aint easy............or cheap!

G8V8

08-13-2008, 11:03 AM

I will keep everybody posted as soon as/if I hear something. I know the rotors are bigger and we know the calipers are Brembo. I'm hoping there are not a lot of differences. Some of us with '04+ GTPs wanted to upgrade to the GP GXP brakes. They were bigger in the front and way bigger in the rear than stock GTP brakes. The calipers were different too.

At that time i knew a guy who worked on the GM design team that designed the brake system for the GP GXP.

He told me the ONLY common piece in the entire braking system was the fluid! Even the BCM (brake control module) was different and it cost $1200 alone. The GP GXP had 20%more braking power in the front and almost 40% more in the rear. Because of this the brake proportioning system was calibrated differently and with changing it, switching to a full set of GP GXP rotors and calipers could lead to premature rear lock-up. This also totally screwed with the ABS.

Without a new BCM, if you were in high delta-mu situations, like patchy ice or snowy shoulders and dry roads and had to brake hard, the rears could lockup and yaw the car faster than the GP BCM/ABS could correct for and end-up spinning out.

He suggested that in the case of the GP, only doing the front swap to GXP would probably be OK as the FWD GP was heavily front-biased anyway.

I bring this up to point out that a swap may be more involved than just rotors and caliper/mounts. We must think of this as a system much in the way Pedders treats the suspension as a system that is designed to work together and compliment each other.

Some guys with GPs did just the fronts, some did all 4 and other, like me just did the F-Body front rotor/caliper swap.

G8V8

08-13-2008, 11:05 AM

I just got this. It is a start. Greg is a good guy and I've invited him to join us here.

<<<
Ed,
Here is what I have for the GXP brakes.? I didn't check it out until you mentioned it.? The rear knuckles are different for the GXP for some reason.? The fronts are the same part number so far but they don't have the front GXP brakes listed yet.

Front GXP brakes are not listed yet.

Rears GXP brakes

Rotors - 92218356

calipers - no part number yet

knuckles

LH - 92203813

RH - 92203812

I will have to stop over at that forum also.

-Greg

>>>>

EC-Ryder

08-14-2008, 07:28 AM

That would be very nice indeed, and very helpful once U get to join the highly exclusive and coveted 500hp club http://forum.grrrr8.net/non-cgi/emoticons/smile.gif

Also even though the part numbers maybe different, I found the exact identical part under other model brand with different number, in other unrelated cases.

That to me is counter productive at first glance but I hope they had a good reason than just sheer stupidity...Go figure! LOL

It's all good!

Cheers!

Radrace19

08-14-2008, 07:50 AM

Hi everyone,
I am the one helping Ed with the GXP brakes. I will try and post updates to the part numbers when GM releases them to the parts catalog.

When GM changes a part number the reason is usually a design change or a manufacture change.

I know I am not a site sponsor but you can mail any requests for GM part numbers to me at GregWas@PacePerformance.com or Radrace19@aol.com
and I would be happy to help.

-Greg

GRRRR8

08-14-2008, 07:51 AM

You could be! I have used Pace in the past. We would love to have a GM vendor/sponsor

bigtreepu

02-19-2009, 05:51 PM

resurrect?

r33pwrd

02-19-2009, 05:57 PM

caliper part # has been around awhile...

vipz28

02-19-2009, 06:21 PM

Pace Performance is already looking at this too... The brakes will bolt right up, you'll need brackets, calipers, pads, rotors. And mounting hardware of course.

GeorgeInNePa

02-19-2009, 06:22 PM

caliper part # has been around awhile...
Look at the dates on those posts.

GT G8

02-19-2009, 07:17 PM

Pace Performance is already looking at this too... The brakes will bolt right up, you'll need brackets, calipers, pads, rotors. And mounting hardware of course.

Estimated cost?

GeorgeInNePa

02-19-2009, 08:03 PM

Estimated cost?

800ish for the fronts

http://forum.grrrr8.net/showthread.php?t=2313&page=2
(http://forum.grrrr8.net/showthread.php?p=49082#post49082)

Greg@PacePerformance

02-20-2009, 01:40 PM

From looking at our GXP on the lot in the COLD and snow and comparing it next to a GT.
The rear calipers are exactly the same as the GT and the parts catalog says the same thing. The parts catalog has a different part number for the rear rotors but from what I can see the GT rotors are painted black and the GXP rotors are plated/painted silver. I am half tempted to say the front rotors are the same way and the only difference with the front is the Brembo calipers, but that is without mesuring any of the rotors.
-Greg

GT G8

02-20-2009, 01:56 PM

Hmm, any vendors stocking or selling these at the moment? Or should I go thru GM?

GeorgeInNePa

02-20-2009, 02:01 PM

Hmm, any vendors stocking or selling these at the moment? Or should I go thru GM?

There are none available yet from GM.

Greg is trying.

Greg@PacePerformance

02-20-2009, 02:01 PM

Hmm, any vendors stocking or selling these at the moment? Or should I go thru GM?

I already have some on order and I will have them available for an unbeatable price as soon as GM releases them.

-Greg

GT G8

02-20-2009, 02:09 PM

I already have some on order and I will have them available for an unbeatable price as soon as GM releases them.

-Greg

Oooh man, I am all over that.....

:woohoo:

Cashed

02-20-2009, 02:46 PM

I already have some on order and I will have them available for an unbeatable price as soon as GM releases them.

-Greg

:watch: I will be patiently waiting...

dklau33

02-21-2009, 02:46 PM

IIRC aren't the GXP front rotors 14" while the GT front rotors are almost 13"? Here's from Edmunds.

Brake Type (front)14-inch ventilated rotors, 4-piston fixed calipers
Brake Type (rear)12.8-inch ventilated rotors, single-piston sliding calipers

Anyways, here's hoping it's a straight bolt on affair. Greg, you will definitely be hearing from me as soon as you have kits ready.

G8-SSV

02-21-2009, 02:51 PM

full fromt kit is $780 + tax

rotors NOT the same ....

GT G8

02-21-2009, 04:03 PM

full fromt kit is $780 + tax

rotors NOT the same ....

Front kit includes what?

r33pwrd

02-21-2009, 04:20 PM

Front kit includes what?

rotors / calipers / pads

BluYa76

02-23-2009, 05:01 PM

Money is already set aside for this upgrade once kits are available! Hope we don't have to wait too long...

Tim

SLVRG8GT

02-23-2009, 06:20 PM

Originally Posted by G8-SSV
full fromt kit is $780 + tax

rotors NOT the same ....

Great price if holds true. I'll be in line waiting

vipz28

02-23-2009, 06:31 PM

rotors / calipers / padsbrackets too i hope :nah:

Greg@PacePerformance

02-24-2009, 08:22 AM

brackets too i hope :nah:

No brackets needed.
-Greg

SLVRG8GT

02-24-2009, 11:44 AM

No brackets needed.
-Greg

:woohoo:

Cashed

02-24-2009, 02:27 PM

No brackets needed.
-Greg

The fact that the G8 brakes bolt right up and the low cost has me setting money aside for these as well.

Are these the same calipers on the 04 CTS-Vs? I was looking at the brakes on my parents' V and they look very similar. Only difference being the 6 lug rotors.

Greg@PacePerformance

02-25-2009, 06:16 AM

No they are not the exact same. They might be close but the part number is not the same. The pads do fit the STS-V's and the rotors are the same as the new Camaro SS.
-Greg

G8GXP4now

02-25-2009, 11:07 AM

Any reason we can't put the larger rotors and brembo's on the rear brakes? Will it interfere with the rear tire clearance?

Greg@PacePerformance

02-25-2009, 11:22 AM

All I can go buy is part numbers in the GM catalog right now, and I checked the rear calipers and none of the part numbers match any Camaro V6 or SS part numbers. So it is going to take physicaly comparing the parts to verify if it will work or not.
-Greg

dklau33

03-03-2009, 09:21 AM

the villagers are getting restless... bump for update

Greg@PacePerformance

03-03-2009, 10:12 AM

The update is I still can not order the rotors from GM. They keep cancelling my order. One caliper is available and I am just waiting for it to arrive from the warehouse. The other caliper is still on backorder with no ETA but I have the order in with GM. The pads are in stock ready to go.

That is all I know so far. Sorry everyone for the delay but it seems GM is having stocking problems with all of the new G8 parts.

BluYa76

03-03-2009, 10:39 AM

Thanks Greg for the update and I can not wait till this comes out!

Tim

GotMyG8V8

03-03-2009, 12:32 PM

Man I'm thinking this might have to be my next upgrade after the Vararam and a tune. I really don't like how the brakes feel in the car lol. I really don't have the facilities (a garage or work area) to do these brakes, how much do you guys think it would cost for a good place to do them?

Greg@PacePerformance

03-04-2009, 07:04 AM

One caliper has arrived. Pics to follow soon. GM shipped it in a box that is 3 or 4 times as large as the caliper with no packing material and the caliper is now damaged and I have to wait on another from GM.

SLVRG8GT

03-04-2009, 07:30 AM

Greg@PacePerformance

03-04-2009, 09:01 AM

Even though eveyone knows what they look like here are the pictures. :woohoo:
http://PacePerformance.com/ProductImages/grrrr8.net/caliperfront.gif
http://PacePerformance.com/ProductImages/grrrr8.net/caliperback.gif
http://PacePerformance.com/ProductImages/grrrr8.net/calipertop.gif
http://PacePerformance.com/ProductImages/grrrr8.net/caliperside.gif

Juniorss

03-04-2009, 09:57 AM

If only we were able to get some red ones... hmmm

dklau33

03-04-2009, 03:36 PM

Thanks Greg! My tax return was much higher than anticipated this year so I have a little play money to work with. I'm putting it aside for this sexy and very functional upgrade!

GT G8

03-04-2009, 03:53 PM

If only we were able to get some red ones... hmmm

I'll be buying these and painting them Red.

TouchOfGray

03-04-2009, 06:15 PM

Want! Of course a little red paint will do wonders too...

Cashed

03-05-2009, 07:55 AM

I am patiently waiting for you to be able to sell these to us, Greg! :watch:

I personally think the silver will look good on my MGM.

dklau33

03-05-2009, 09:49 AM

I am patiently waiting for you to be able to sell these to us, Greg! :watch:

I personally think the silver will look good on my MGM.

+1 Silver and MGM FTW. :woohoo:

G8V8

03-06-2009, 06:58 AM

Greg, do you know if there are any differences in the part numbers for the master cylinder, brake control module, etc.? I'm just wondering if the front rotors, calipers and pads are all that is different. with TC, ESC and ABS all linked to the brakes it would be nice to know we were not messing with these.

Greg@PacePerformance

03-06-2009, 07:08 AM

Master cylinder the same.
Same EBCM.
It looks eaiser to do a complete swap then the GP GXP.

G8V8

03-06-2009, 09:17 AM

Cool. Put me on your list. Tax time came at the right time.

wonder if these will fit inside my 18" winter wheels?

Greg@PacePerformance

03-06-2009, 10:16 AM

^^^^^^^^
That is the question of the day. I will be able to tell everyone once a complete kit hit my doors.
Or someone with a GXP tries it
Our GXP we had on the lot sold after 3 days and it was an auto.

JimmyJazz

03-06-2009, 06:45 PM

Put me on the list too!

GeorgeInNePa

03-06-2009, 07:30 PM

Greg, if you are keeping a list, put me on it for the GXP front brakes.

SLVRG8GT

03-06-2009, 08:26 PM

Greg, if you are keeping a list, put me on it for the GXP front brakes.

x2

MtbDoc

03-06-2009, 08:46 PM

I am definitely interested as well. BIG brakes are far more important for those of us who live life 30 twisty-turnies at a time (as opposed to some girly 1/4 mile at a time!).

GT G8

03-07-2009, 11:53 AM

.
x2

x3

G8V8

03-09-2009, 04:30 AM

Hey Greg,
Are the hoses the same? Any other brake related items we should think about being different? Is ABS controlled by the EBCM?
Thanks,
Ed

Greg@PacePerformance

03-09-2009, 06:38 AM

Hey Greg,
Are the hoses the same? Any other brake related items we should think about being different? Is ABS controlled by the EBCM?
Thanks,
Ed

Yes hoses have the same part number for the GXP and GT. I am still trying to find out if the bolt for the hose is the same.

Yes the EBCM controles the ABS. (Electronic Brake Control Module)

G8V8

03-09-2009, 08:04 AM

This is so cool. The GP to GP GXP swap was a PITA. This is much easier.

Greg@PacePerformance

03-09-2009, 08:06 AM

Just verified that the Brembo banjo bolt and the stock bolt are the same.

The replacement caliper arrived today and it was also damaged. I am going to try one more time and see what happens. Then I will have to call someone about the packaging.
GM also released the other caliper off backorder and I have them on the way. We are just waiting on the rotors and then I can get a firm price shipped.

I will send out one kit to verify it fits with stock 18's then we will be ready to take orders :)

G8V8

03-09-2009, 08:57 AM

Sweet!

1BDG8GT

03-09-2009, 09:11 AM

this is good news.i also would like to start off with a set up for the front please.add me to the list.thanks

Greg@PacePerformance

03-09-2009, 09:26 AM

I am also digging into the Camaro rears. I won't know much until parts are availble though.

TouchOfGray

03-09-2009, 09:56 AM

.

x3

x4

SLVRG8GT

03-09-2009, 10:34 AM

Greg@PacePerformance

03-10-2009, 11:52 AM

x4

Put your interest here please (http://forum.grrrr8.net/showthread.php?p=57474#post57474)

Greg@PacePerformance

03-16-2009, 11:00 AM

Brembos will NOT work with the stock 18" wheels
http://PacePerformance.com/ProductImages/grrrr8.net/G8Stock18wheel.jpg

We had a new sedan on the rack for a brake job and I bolted a GXP caliper up but the wheel would not clear the caliper. :(
There was plenty of room between the caliper and the rim but the spokes didn't have enough offset to clear the thick Brembo.

I am starting to think the stock 19's won't clear either.
I will know for sure what works when I get a whole set sent to the first customer for testing. And I am still waiting on rotors.

dklau33

03-16-2009, 11:05 AM

IIRC the stock 18" wheels have a +48 offset. I know that spoke design and positioning play a factor as well, but do you think a wheel with an offset of +42 would clear? Or lets say the stock 18" had an offset of +42 instead of +48. Would you say that would clear?

GT G8

03-16-2009, 11:12 AM

I am still waiting on rotors.

Are the rotors for the G8 GT a different size from the GXP?

Greg@PacePerformance

03-16-2009, 11:14 AM

I guess I should have not said offset. I don't know much about wheels so I might be wrong. The caliper was hitting the spokes before the wheel was seated on the hub. I would guess it had about 1/2" difference but I really didn't look real close since I didn't want to scuff the caliper.

Greg@PacePerformance

03-16-2009, 11:17 AM

Are the rotors for the G8 GT a different size from the GXP?

Everything I see says yes but I am not sure until I compare the GXP's to a stock rotor.

Greg@PacePerformance

03-16-2009, 11:21 AM

OK This thread is now on hold..... My stupid ass didn't put the rotor back on the car before I put the wheel on. The rotor spacing WILL help!!! Check back soon :P
It is a Monday!

G8V8

03-16-2009, 11:45 AM

It's OK Greg. Repeat after me, it's OK.

Greg@PacePerformance

03-16-2009, 11:52 AM

It's OK, It's OK - Thanks Ed.

The stock 18's still don't fit. It was much closer but you would need to run about a 1/4" wheel spacer to get them to clear.

Also the stock bolts didn't want to thread into the Brembo caliper and GM only lists one set of bolts. So I will check into that a little bit more also.

G8-SSV

03-19-2009, 12:01 PM

Greg@PacePerformance

03-19-2009, 12:14 PM

Because the bolt goes through the knuckle into the caliper on the G8.

dklau33

03-19-2009, 12:23 PM

Doubt they would clear 17" wheels. Usually big brake kits with 14" rotors need at least 18s.

GotMyG8V8

03-19-2009, 12:42 PM

This is exciting, it's like a drama. You get excited, then let down. Then there's new hope, but that hope is dashed lol

GT G8

03-19-2009, 01:10 PM

This is exciting, it's like a drama. You get excited, then let down. Then there's new hope, but that hope is dashed lol

And that my friend, is why God invented Popcorn. -----> :watch:

Greg@PacePerformance

03-19-2009, 01:13 PM

Isn't that why we are all here. A little free entertainment :D

SLA

03-19-2009, 02:12 PM

Isn't that why we are all here. A little free entertainment :D

It may seem free, but every time I come here I end up wanting to buy something else for my car. First I was just going to do an intake and a tune, then I added LT headers, then I saw this, and now just yesterday I decided I'm going to do a 2800 stall. lol, It never ends http://smiliesftw.com/x/eek3run.gif

G8-SSV

03-19-2009, 07:13 PM

Because the bolt goes through the knuckle into the caliper on the G8.

Hm... CTS-V bolts ?

GRRRR8

03-19-2009, 07:18 PM

It may seem free, but every time I come here I end up wanting to buy something else for my car. First I was just going to do an intake and a tune, then I added LT headers, then I saw this, and now just yesterday I decided I'm going to do a 2800 stall. lol, It never ends http://smiliesftw.com/x/eek3run.gif

OOOOPS! My bad! LOL!!

dklau33

04-13-2009, 10:54 AM

Bump for update?

Greg@PacePerformance

04-13-2009, 12:36 PM

Rotors are still on backorder. They are using all available parts to build Camaros, or GM hasn't paid the bills.

dklau33

05-21-2009, 02:02 PM

Still the same story Greg? No rotors?

Greg@PacePerformance

05-22-2009, 05:23 AM

Nope lol kit in progress Will update after the weekend. I have a complete test kit in the field. I should have a solid price on Tuesday.

G8V8

05-22-2009, 07:02 AM

Nope lol kit in progress Will update after the weekend. I have a complete test kit in the field. I should have a solid price on Tuesday.

:secret: :)

Rican219

05-22-2009, 08:06 AM

Waiting

G8V8

05-22-2009, 08:23 AM

Waiting

Ah, patients, grasshoppa. All answers will be spread out before you, soon, very soon.

dklau33

05-22-2009, 10:07 AM

Nope lol kit in progress Will update after the weekend. I have a complete test kit in the field. I should have a solid price on Tuesday.

Nice! I got my GXP rear diffuser through you guys as promised so I won't hesitate to go through you guys again. Can't wait.

Greg@PacePerformance

05-26-2009, 08:52 AM

It is looking like the price will be $900.00 shipped with OE brake pads.

I am having a problem coming up with the correct part number for the caliper mounting bolts but I am waiting a call back from GM engineering with the correct part number.
Link to kit (http://PacePerformance.com/index.asp?PageAction=VIEWPROD&ProdID=252986)

99-LS1-SS

05-26-2009, 09:21 AM

Greg@PacePerformance

05-26-2009, 09:30 AM

No. I found some for Ed from a Caddy but they are slightly too long. The Camaro SS has a different bolt all together also so that didn't work either.

We know they are 12M x 1.75 but the correct lengh is yet unknown.

dklau33

05-26-2009, 09:55 AM

Thanks Greg for being the first to put this together and at a very decent price. I just placed my order. Hopefully these will fit without spacers on my wheels.

Greg@PacePerformance

05-26-2009, 09:55 AM

Wrong thread :)

G8V8

05-26-2009, 12:34 PM

Greg,
if the bolts were the length of the GT bolts + 1/8" to 1/4" more, they would be prefect. The bolts in the kit will fit. It is just that there is not a lot of clearance between the end of the bolt and the rotor hub. I good, strong 1/8" thick washer under the head would also provide plenty of clearance with the CTS bolts.

Ed

Greg@PacePerformance

05-26-2009, 01:28 PM

I'm checking with Crazy Paul. I would rather use the correct bolt that I know GM has somewhere. :)

2008g8gt

05-26-2009, 06:14 PM

am i reading correct that this is a front kit and also has rear rotors as well? Im sorry if this has already been asked. Ive been to both forums trying to keep up lol

G8V8

05-26-2009, 06:16 PM

No. It was just describing the stock size of the rear rotors. This kit is front only, so far. The GXP and GT use the same rear brakes.

Big Daddy G8

05-27-2009, 07:43 AM

Just my $.02

I installed JBA slotted rotors and HAWK HPS pads on my G8 GT to upgrade the brakes. Well, I drove a new GXP 6pd for a few days (a lucky sob is getting it here at work) and I have the say that the Brembos and larger rotors are by far a better upgrade if possible with your wheels. I say this because immediately when I got back into my G8 GT, I noticed the difference in braking performance on the first stop. While this does not take into effect how the oem gxp pads will hold up to track days compared to my HPS's (we will see) but for initial bite and overall feel, I would recommend the GXP upgrade if you can.

The 6pd is a difference maker by the way! It makes the car so much more involving.