Late 944 330mm Front Brake Option

This is a budget-friendly option for the late model 944s to get a 330mm rotor in the front:

2005-2006 GTO caliper brackets are a bolt-on ordeal.  The only thing you need to do is get 12mm ID- 14mm OD sleeves so you can use the 944's 12mm bolts in the GTO's 14mm bolt hole.
-McMaster-Carr Part# 6679k16
-Grainger Item# 786Y72/ Model# ZUSAB-PB-39

Use a rear rotor from a 2001-2016 911. A few part numbers:
- Brembo 09.C878.11
- Fremax BD3351 & BD3350

You will need to slightly shim the caliper bracket so that it is centered over the rotor. In my case, I had to use 1/32" (.8mm) shims.

The caliper and pads can come from either a 2005/2006 GTO or a base C6 Corvette.

For the flex line, GTO flex lines will work.  StopTech 950.62004 is a stainless option.

This upgrade requires a minimum wheel diameter of 17".

My wife has an 04 GTO. That's exactly the same thing I had to when I put the 05-06 GTO calipers on her car. Her car stops extremely well, so the 944 will stop great with those.

Awesome find on the fitment.

MuhThugga wrote:The only thing you need to do is get 12mm ID- 14mm OD sleeves so you can use the 944's 12mm bolts in the GTO's 14mm bolt hole.

Can you provide some detail or link to what these sleeves are?

Once my conversion is rolling I will most likely be looking at some sort of big brake upgrade with my hydroboost now that I have 17's as I'm not sure the standard brakes on an 88S are going to be "awesome" as much as this would be or having a turbo's car brakes to begin with.

This is what I used

https://www.grainger.com/product/786Y72?gucid=N:N:PS:Paid:GGL:CSM-2295:4P7A1P:20501231&gclid=CjwKCAjwpayjBhAnEiwA-7ena9oJ-aEK5VUuHN2O73byfT9-YntOumpm_VAfld8ZM6yknIcF_2JWvxoC-IoQAvD_BwE&gclsrc=aw.ds

Awesome link, thanks for that and I think many of us owe you thanks for logging in every day and helping everyone with the been there done that wouldn't do it again.

Should have asked before I got my borla! Lol

So last question on this. So press these sleeves in and retap to use the 12mm 944 bolts?

Gutterboy wrote:Awesome link, thanks for that and I think many of us owe you thanks for logging in every day and helping everyone with the been there done that wouldn't do it again.

Should have asked before I got my borla! Lol

So last question on this. So press these sleeves in and retap to use the 12mm 944 bolts?

No need to press the sleeve in. It doesn't need to be an interference fit as it is just taking up the difference in bolt size. No need to retap, either. The sleeves don't have to be threaded. Just insert the sleeves and then feed the bolts through like you would for the factory caliper.

I updated the first post with sleeve part numbers.

Hotrodz of Dallas wrote:My wife has an 04 GTO. That's exactly the same thing I had to when I put the 05-06 GTO calipers on her car. Her car stops extremely well, so the 944 will stop great with those.

Awesome find on the fitment.

I've had a GTO since 2006, and when I was looking around for brake upgrades to the 944, I saw one casual mention of someone thinking that the GTO's bolt pattern was close, but nothing else was mentioned. Since I had spare calipers and brackets laying around, I decided to give it a try and started laughing at how they bolted right on. Finding a rotor was a bit tougher thanks to Porsche's stupid bolt pattern, but playing with my calipers and spending some time on Brembo's EU website allowed me to find something that would work. I didn't want to post up until I had the car driving, but with the GTO calipers in the front, the stock ones in the rear, and the Mustang brake master, the brakes feel pretty good to me.

curious, no need to upgrade the rears?

Rears honestly don't do much braking, but turbo rear calipers are a direct bolt on. And who knows. GTO rear calipers might be.

then perhaps its some gto calipers with pads and a can of red paint with a 948 stencil in black to make all 4 corners look pretty as if there were a set.

planning to also get my boxster twist 17" wheels redone in black with 76mm black center caps with colored porsche insignia.

already have my eyes on all the finishing touches before i even get first fire done. lol

Hotrodz of Dallas wrote:Rears honestly don't do much braking, but turbo rear calipers are a direct bolt on. And who knows. GTO rear calipers might be.

Unfortunately, the GTO calipers are not a bolt-on option. The bracket bolt pattern is much wider on the 944. The G8 rears might be an option, but I don't have a set to try.

MuhThugga wrote:

Hotrodz of Dallas wrote:Rears honestly don't do much braking, but turbo rear calipers are a direct bolt on. And who knows. GTO rear calipers might be.

Unfortunately, the GTO calipers are not a bolt-on option.  The bracket bolt pattern is much wider on the 944.  The G8 rears might be an option, but I don't have a set to try.

Stock 944 turbo rear calipers would most likely work very good with the GTO fronts