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930 Brake question

I have a 77 930 with the small S brakes
I do have a set of the big 930 brake from a 80"s.

Question ..can i just get new big stock say 83 930 rotors and just swap the S caliper with the new Big 930 calipers...call it a day with all new SS lines DONE? that Easy .. right

thanks
Old 05-02-2014, 04:33 PM
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Not so easy, for the fronts rotors need to be milled down to a smaller diameter, you'll need a 21 mm Mercedes master cylinder and an insert or lengthen brake pushrod, for the rears you need to check your mounting points on your trailing arms. If you have the mounting ears on the rear trailing arms, you'll have to face and tap them, or you have to face the brake caliper and cut mounting holes and re drill calipers for 3 inch spacing on the stock mounts.

930 rear caliper modification for 911

Contact Steve at Rennsport Systems he'll hook you up with what you need, or go with VCI. I went with facing and tapping my trailing arms and got all the parts from Rennsport sys, Steve is a great guy, has been there and done that...
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Old 05-02-2014, 05:18 PM
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OMG ill keep the the 77 old skool S brakes before i machin these are vintage parts

one thing i learned with the SWB and LWB dont F*** with it .

Ill sell them soon then

thanks so much
Old 05-02-2014, 05:26 PM
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or why cant i get rsr or the correct 930 struts for these brakes and save all the OG parts.
Old 05-02-2014, 05:38 PM
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Why do the front rotors need to get milled down?
The 930 calipers are available new, so I'd use the ones you have.

The front calipers bolt right up. You will either need 930 front hubs or custom hats for the rotors.
The rear calipers need to be modified, and the rotors are a direct bolt on.

Either Rennsport or VCI should be able to set you up with the parts you'll need, m.c. kit etc.
I bought a VCI kit back in 2000 for our '73 Targa, then moved them to the '75 carrera.
I up graded the front hats to Rennsport hats that used 993 turbo rotors ( turned down to clear 15" wheels).
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Old 05-02-2014, 06:07 PM
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I'm using the custom rennsport rotors I don't quite remember why, but the rotors untouched would not let the caliper seat properly to bolt to bilstein struts ( the roots hit the center bridge of the caliper).

To the OP, the trailing arms are the missing link, if you have the dog ears already cast, it's easy to face/drill/tap with a drill press.

BTW the s calipers are fine spirited street driving, I'd find only after a couple hours if twistys they would start to exhibit fade, I tend to be a bit hard in brakes too. I changed because I was doing a few Track days and wanted the extra clamping...

Are you having issues? Brake fluid, cooling, and proper pads should cure for street driving.
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Old 05-02-2014, 09:01 PM
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Ive got these on my 77 930 euro
Stops on a dime no fade after 60000k

the black ones are cheap as chips on Ebay for some reason,


These ones are $$$
I was lucky got them with the car

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Old 05-02-2014, 09:57 PM
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Here is what did.....I have all of my original brakes parts in a box. In the mean time, these 930 brakes are unquestionably the best
930 Brake upgrade on early 930
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Old 05-03-2014, 05:50 AM
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Quote:
Originally Posted by Robbbyg View Post
the black ones are cheap as chips on Ebay for some reason . . .
Which "black ones" are you referring to Robbbus-Maxximus? The black 930/911 Turbo calipers sell for quite a handsome sum (such as the following two examples):

Porsche 911 930 Brake Calipers and Rotors | eBay

Porsche 930 917 Brake Calipers Complete Set of Four | eBay
Old 05-03-2014, 07:41 AM
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I thought Suncoast Porsche in Oregon was selling new 4 caliper sets for $2800.00. Add in everything else and you'll be into it the mid $4,000.00.
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Old 05-03-2014, 09:46 AM
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I have these laying around and dying to bolt them on
anyone have a used later rotor so i can see if it is just bolt on

thanks
Old 05-03-2014, 06:41 PM
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Old 05-03-2014, 06:42 PM
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Are these 930 calipers painted red?
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Old 05-03-2014, 07:15 PM
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it pretty durable i would say powder coated
Old 05-03-2014, 07:16 PM
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Quote:
Originally Posted by Ronnie's.930 View Post
Which "black ones" are you referring to Robbbus-Maxximus? The black 930/911 Turbo calipers sell for quite a handsome sum (such as the following two examples):

Porsche 911 930 Brake Calipers and Rotors | eBay

Porsche 930 917 Brake Calipers Complete Set of Four | eBay
Wow i didnt think they were that cheap when i said cheap as chips i meant they were too cheap at round $1000 each

That second lot sold for around $3000 for all 4 ! That is Very CHEAP for what they are.
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Old 05-04-2014, 01:46 AM
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One Day all 930 parts are going to be very very very expensive,,
And youll only be able to find parts for them in Vintage Antique shops Between the old Silver cultery and piano rolls...

This is true because i just sold my 8pin cdi box for $1000 I didnt see that coming but it confirmed my sentiment on rare parts.
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Old 05-04-2014, 01:55 AM
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Quote:
Originally Posted by Robbbyg View Post
Ive got these on my 77 930 euro
Stops on a dime no fade after 60000k

the black ones are cheap as chips on Ebay for some reason,


These ones are $$$
I was lucky got them with the car

Quote:
Originally Posted by dporsche74 View Post
Quote:
Originally Posted by gumba View Post
Are these 930 calipers painted red?

Those are factory "black" 930 rotors that have been painted or powder coated red


Quote:
Originally Posted by Robbbyg View Post
One Day all 930 parts are going to be very very very expensive,,

This is true because i just sold my 8pin cdi box for $1000 I didnt see that coming but it confirmed my sentiment on rare parts.
Tell that guy to call me, I've got some special NLA 930 ferry dust I'll make him a deal on!
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Old 05-08-2014, 06:32 AM
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You can bolt on the front calipers to your struts. You do need the 930 rotors. I have done this on my 77 track car.

For the rears, you need 930 trailing arms which relocate the caliper to behind the hub or you have to machine the calipers and get some spacers to mount these in the original location ahead of the hub. Once again, you need 930 rotors.

This swap takes an evening and is better than the early 930 stuff.

If you don't want to do this, you can significantly improve the early 930 brakes by:

1. Get some good quality pads (I like Pagid RS-29).
2. Replace your brake fluid with Brembo LCF-600.

You wont regret it.
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Old 05-08-2014, 06:56 AM
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Quote:
Originally Posted by unclebilly View Post
You can bolt on the front calipers to your struts. You do need the 930 rotors. I have done this on my 77 track car.

For the rears, you need 930 trailing arms which relocate the caliper to behind the hub or you have to machine the calipers and get some spacers to mount these in the original location ahead of the hub. Once again, you need 930 rotors.

This swap takes an evening and is better than the early 930 stuff.

If you don't want to do this, you can significantly improve the early 930 brakes by:

1. Get some good quality pads (I like Pagid RS-29).
2. Replace your brake fluid with Brembo LCF-600.

You wont regret it.
unclebilly is correct as this is the set-up I did and have on my 73S..
I had my calipers machined and used spacers.. the rotors simply go on as normal. On the front, the calipers will bolt onto struts with 3.5" spacing.. you will need both the hub and the rotor.

Another alternative for early 930's would be the use of the Boxster caliper.
Its a helluva upgrade in stopping power, still a Porsche part, its Purdy, its light, and if you shop wisely it can be a lot more cost effective than the purchase of the 930 calipers, rotors, and required machining.

I am in the process of putting together a set of these for my cousins SC. Waiting to see what my machinist friend will charge for cutting the adapters so there may be extras available. Although they are currently available from several sources.. I just felt they were a little spendy.
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Old 05-08-2014, 07:33 AM
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