Anybody use the Brembo GT series big brake kits listed on ebay for 1967-89 Porsche 9

[Diggem]

I am just wondering if anybody has purchased the Porsche 911 1967-1989 GT Brembo Series Cross Drilled 1-Piece Rotor Front Big Brake Kit on ebay before?

I do not have a complete brake system for my 1977 Porsche 911 S yet and I was going to purchase one of those to get started.

They come with 4 piston Brembo calipers, 12.72 drilled rotors, pads, brake lines and caliper mounting brackets.

[jamesjedi]

That set up would be overkill. It would not serve a purpose for a 2.7 L car. You could get Carrera front calipers (84-88). They are wide A calipers. They should be a good match with the original 77 rear calipers.

[Diggem]

Originally Posted by jamesjedi

That set up would be overkill. It would not serve a purpose for a 2.7 L car. You could get Carrera front calipers (84-88). They are wide A calipers. They should be a good match with the original 77 rear calipers.

I want really good brakes that slow the car down in short order with little fade so I figure bigger rotors and better performance calipers are the way to go. Plus I dont have original 77 rear calipers as I am starting from nothing and want a really good set


I have read somewhere that the Porsche Carrera 84-88 didnt really have any more braking performance than a stock set on a 1977 Porsche 911S.

[786]

What size wheels will these brakes require?

[Jeff Alton]

Please post a link. Brembo has done many different "GT Kits" over the years. Once we see the kit in question, we can offer opinions of weather or not is is worthwhile.... Has very little to do with size of your engine, and much more to do with the what sort of use your car sees...

Cheers

[Diggem]

Originally Posted by Jeff Alton

Please post a link. Brembo has done many different "GT Kits" over the years. Once we see the kit in question, we can offer opinions of weather or not is is worthwhile.... Has very little to do with size of your engine, and much more to do with the what sort of use your car sees...

Cheers

Not sure how to post a link.

[sc_rufctr]

Originally Posted by Diggem

Not sure how to post a link.

Copy the URL in full on the Ebay ad and past it into a post here.

[175K911]

Originally Posted by Diggem

I want really good brakes that slow the car down in short order with little fade so I figure bigger rotors and better performance calipers are the way to go. Plus I dont have original 77 rear calipers as I am starting from nothing and want a really good set


I have read somewhere that the Porsche Carrera 84-88 didnt really have any more braking performance than a stock set on a 1977 Porsche 911S.

When I still had the stock brakes on my ‘86, I could lock up a front tire in a panic type stop. So going any bigger on the front isn’t going to give you better braking on the street, just let you lock up the tires faster which is counter to what is needed. And a narrow body ‘77 has even less tire than a Carrera.

The reason for big brake kits is for bigger rotors for better cooling. Which is rarely needed on the street.

And don’t forget that big brakes require a bigger master cylinder.

I agree that just upgrading to Carrera 85-89 brakes is an upgrade for you. The front rotors go from 20mm wide to 24, so a significant increase in cooling potential. And the rear calipers go from 38mm to 42 for better rear braking, but only if you have the wider Carrera flares and more wheel and tire. And for a lot less $$ than what you’d need to spend for big brake kits.

[s5uewf]

Another option may be to simply try some more aggressive pads. If stopping faster / panic stops is your biggest concern, you may be able to swap in some high performance pads and that would be cheaper and easier to experiment with.

[darrin]

Agree with 175k911 — also keep in mind that non factory options frequently bring front/rear biasing issues into play. Never had ANY fade issues on my street driven 86 Carrera with stock brakes.

Diggem - if you’re set on the Brembo style and building from scratch, check out a full 930 setup - proper proportioning for a 911 and beefy, but $$$$$$ for little real world advantage for a street 911

[betterair]

^ , + one .

I use the GT 1 pc Brembo kit on my 86 w 3.6L .
Kit has 323x28mm 1 pc front and 930 rotors on rear.(supplied w kit)

This setup uses my stock mc on the 86 carrera.They are very effective on track and do not fade all day with out additional brake cooling sects,etc.

The 2 negative comments I would make are;
A)that there are NO 2 pc front 28 mm rotors available for this setup .
B)The front Brembo 1 pc rotors weigh 20+ lbs EACH,and they are not directional vane design cooling.
If I go to 2 pc fixed rotors( Rebel racing hats (1.5#? )and Coleman custom DV 30 disks(12 -13 lbs ea),I can shed 5-6 lbs PER SIDE .Are coleman rotors as durable as the Brembos? no clue .Will they shed the heat as well on my car, the way I brake ? still no clue. So There will certainly be a learning curve If I go this route.Oops , getting off track to the OP's inquiry.

Yes, they probably are overkill for a street car /hot rod and you may meed to change the mc .Also notice that brembo is now offering a new kit upgrade that has 2 pc 32 mm rotors.

[betterair]

PS:
x check the e bay adv with Rebel racings adv for these. I don't think the e bay adv range of years ,67-89,that these fit is correct.

[kent olsen]

My story: 1972 911 with a modified twin plug 3.0L. Now she weighs 2200 lbs. Years ago when I lived in Florida I remember a couple of track days at Sebring where I had brake fade with stock brakes but racing pads.

My fix was to replace the disc with ones that are both drilled and slotted, front and rear. That took care of the fade. My one more attempt at better brakes was simply to replace the front "A" calipers with calipers from an SC, which are about 25% more pad area. Now she stops on a dime with a nickel's change.

[wildcat077]

I have 996TT brakes all around on my 89 , first thing is, there was way too much front bias ... something which was somewhat OK in the dry , but in wet conditions it was right down scary.

Anyhow , i did everything correctly with a new 23 mm master , removing the front proportioning valve, installing Pagid RS19 front pads and RS14 rears , still on the track it wasn't ideal , but after installing a Fabcar dual master with a Tilton bias valve it was awesome as i was outbraking GT3's in corners , but for the street it's way overkill !
My car is slowly going back to street duty only and the dual master setup with Track pads is coming off ...

In my opinion , the best setup for street / occasional track use is a complete 930 brake setup !

[Diggem]

Originally Posted by wildcat077

I have 996TT brakes all around on my 89 , first thing is, there was way too much front bias ... something which was somewhat OK in the dry , but in wet conditions it was right down scary.

Anyhow , i did everything correctly with a new 23 mm master , removing the front proportioning valve, installing Pagid RS19 front pads and RS14 rears , still on the track it wasn't ideal , but after installing a Fabcar dual master with a Tilton bias valve it was awesome as i was outbraking GT3's in corners , but for the street it's way overkill !
My car is slowly going back to street duty only and the dual master setup with Track pads is coming off ...

In my opinion , the best setup for street / occasional track use is a complete 930 brake setup !

Due to the prices of 930 parts I will spend more on a complete really used 930 brake system that needs rebuilt then I would a completely new Brembo system.

[Diggem]

Originally Posted by darrin

Agree with 175k911 — also keep in mind that non factory options frequently bring front/rear biasing issues into play. Never had ANY fade issues on my street driven 86 Carrera with stock brakes.

Diggem - if you’re set on the Brembo style and building from scratch, check out a full 930 setup - proper proportioning for a 911 and beefy, but $$$$$$ for little real world advantage for a street 911

I am not set on building from scratch I have to because I dont have ANY brakes at all. I basically want to spend money getting a really great set of brakes the first time.

[darrin]

Diggem -- understood. What's your ultimate goal for your car? See a few old posts about doing a renegade/LS1 v8 conversion and searching down 930 parts.

As others have mentioned above, even stock early brakes will lock up tires no problem when pushed hard -- and have the advantage over many aftermarket "solutions," as they'd lock up front and rear wheels in proper proportions. Fade (especially with the higher rotor mass offered by the later carrera setup) recommended above (and that I continue to run on my 180k mile carrera) would only really manifest itself in a track setting (even with bumped HP).

If I was in your position, I'd start with a tried and true setup (carrera brakes and matching MC), get your car put together and running, and then see if it needs more brakes. Going with an aftermarket solution up front(especially if you're unfamiliar with the idiosyncrasies of a 911) seems to invite more problems/issues than it solves (e.g. proportioning, clearance, parts/pads selection, etc.).

Similarly, on the transmission front, a healthy 915 is going to be a straightforward matchup for a n/a 911 engine of any vintage, but could be a weak link with a v8 conversion or turbo. Converting a '70s 911 to a g50 invites a lot of issues and $$$$ -- perhaps a 4 speed 930 box (which I understand would fit in your 77 911s without modification would be a good compromise with such a high HP engine?

In the end, trying to give you conservative advice that will help move you from project to fun driving car. Seen too many projects sell for a loss after frustration trying to get them to fruition and these cars (even in bone stock configurations) are too much fun to let languish.