964 Brake Caliper Fit a 74 911

[matty74]

Hi ther will 964 front calipers fit a 74?

Can I just do the front and leave the rear stock?

Do I use carrera rotors?

I intend putting in a 23mm master cylinder?

Any advice appreciated?

Matty74

[Peter Bull]

Hi Matty74,

do a search on brake upgrade on this forum first. And maybe on Bill Verburg next, and then you can have a look
here, and here.

You'll find heaps of info.

Good luck.

/Peter

[Bill Verburg]

Both of the sites that Peter referenced are mine.

There is another one specific to 964 brakes on a 911 here


Short answer , there are 3 ways to do it. 2 are right , one is poor

using Carrera rotors is a poor way to do it.

you need to do both ends of the car at once.

yes, you need a 23mm m/c

[matty74]

So I need to go 964 Brakes all round?

[Bill Verburg]

If you do the front then yes you will need to do the back.

[911-32]

Not necessarily. 964 front calipers over 951 discs at the front and 3.2 calipers over 3.2 discs at the rear will get you very close to the 964 bias with just a tad more front bias. I am using this set-up with a std late 3.2 master cylinder. Its a very nice package for a light 911. This is basaically the VCI set-up - they adapted my front calipers and supplied brackets - but with out the rear 964/951 calipers which suffer from pad overhang if used with 3.2 rear discs.

There is a huge amount of info on Pelican on this if you search. Using my name in the search will find most of the info.

[Bill Verburg]

Not necessarily. 964 front calipers over 951 discs at the front and 3.2 calipers over 3.2 discs at the rear will get you very close to the 964 bias with just a tad more front bias.

Funny, I thought that would be considered doing both ends of the car, My bad

there are hundrds of different ways to do this, some good, not some.
some need m/c some don't
some need wheels some don't

[RallyJon]

I have some rotors you may find useful...

Stoptech 282x28 rotors.

[matty74]

I read the articles very helpful, I have 15" rims so I'm looking at 964 or boxster.

The calipers on the rear of the 74, will they work OK withnboxster calipers? and can I use a 23mm master with these?

[Bill Verburg]

I have 15" rims so I'm looking at 964 or boxster.

Then for mostly street use the Boxster is a better choice, you will use Carrera rotors f/r, the rear calipers can be either Boxster rears or Carrera rears(but not '74 911 rears), no p/v and an ATE 23mm non boosted m/c kit

[matty74]

What year boxster front calipers can I use? is 97 - 99 OK?

[Bill Verburg]

Originally posted by matty74
What year boxster front calipers can I use? is 97 - 99 OK?

Any year Boxster, not Boxster S.

Don't forget that to use Boxster calipers you will need caliper adapters. TRE is a good source

[911-32]

Originally posted by Bill Verburg
Funny, I thought that would be considered doing both ends of the car, My bad

there are hundrds of different ways to do this, some good, not some.
some need m/c some don't
some need wheels some don't

Don't be so serious

I was only trying to clarify - perhaps in a not too clear way.

If I p!ssed you off at all then you have my apologies. You know too much about this stuff to risk offence

[matty74]

I have decided to go with Bills Option 3 for my 74 911s, As I love my 15inch fuchs and they ain't going anywhere


3. For the front, 282.5x24 mm rotors used with Porsche Boxster monoblok calipers(~109cm2/caliper pad area) and the 290x24 rear rotors used with stock '84-'89 wide M(42mm pistons) rear calipers. For this combination the proper f/r hydraulic bias is obtained if no proportioning valve is used. The benefits of this setup are the slight increase in thermal reserve achieved from the larger rotors and additionally higher clamping force at the front which can best be utilized with larger front tires.

Now the questions

1. The rotors to work with these, can I fit rotors 84-89 Carrera all round or is there some modification required? Call me a wanker but I'd like cross drilled for a bit of bling

2. Adapters for the boxster calipers to fit my 74 strut do I need them if so where can I get them?

3. The boxster calipers are off a 97 - 00 model?? what year model calipers do I get??

4. I have a 23mm ATE mc I can use this with this set up?

[jmz]

i just used '88 carrera brakes w/ zimmerman frozen slotted rotors. more than enough for my 215hp '74 sitting on 16x7 & 9 fuchs

[KTL]

1. Yes.

2. Your struts are the 3.5 in. spaced struts and caliper adapters for Boxster calipers to a 911 are commonly available. Not 3 in. as I stated in PM.

3. Like Bill said, any base Boxster caliper will work. They're all the same, some are purply color and some are black. Despite color, they're all the same from 97-present day.

4. You can use the 23.81mm m/c, but it's not necessary absolutely necessary. Unfortunately it's pretty much your only upgrade choice though. The Carrera 20.64 mm m/c is probably more effective for the four piston front and "stock" rear calipers. You'll have more pedal travel though. The 23.81 might push a bit too much fluid and thus you'll have a more touchy pedal. I know my 993 calipers with the 23.81mm 930 m/c on my 87 Carrera have less pedal travel than original and definitely are more sensitive than the stock setup was. You'll need a non-vaccuum boosted m/c for your car, as Bill said previously. ATE makes a kit that will suit your needs. It's the famous (around here) Mercedes Benz truck m/c

[matty74]

Yeah not sure if muy struts are 3inch they are stock 74 front struts

I have the ATE non boosted 23mm mc already

[jmz]

if it's an 'S' then you have the 3.5" spacing and have aluminum 'S' calipers already.

Are you running out of brake?

[matty74]

No I'm going to put some more power backside so I want the brakes sorted first

[matty74]

What brand of Rotor should I buy?

There are Zimmerman for around $180 per pair or Brembo (on ebay) for around $130 bucks cross drilled for the carrera 84 - 89?

what should I buy, or what whould you guys purchase?