930 Calipers left to right swap.

[Abby3.2Carrera]

Hey Guys, i’m in the process of ordering a set of 930 calipers, one of the rear calipers is not in stock. I read somewhere it can be easily flipped for the other side if i order 2 of the same for the rear ? can anyone share more info on this ?
thanks a lot !

[TRE Cup]

Well, Yes and No. I'm pretty certain you will receive the later version rear calipers that have a different inner casting than the early 78-89 versions. The brake line inlet has a different shape left or right caliper. So, see if you can find a pair of early inner castings, or modify yours to mimic the original early version.
Someone here can help by posting pics of the early and later versions so you can spot the differences
BTW- the inner mounting locations are different than what I assume these are intended for your Carrera ? The inner caliper castings have to be modified to fit the rear arms on your car. Costs about $400-500 for a machinist to do this

[Abby3.2Carrera]

Originally Posted by TRE Cup

Well, Yes and No. I'm pretty certain you will receive the later version rear calipers that have a different inner casting than the early 78-89 versions. The brake line inlet has a different shape left or right caliper. So, see if you can find a pair of early inner castings, or modify yours to mimic the original early version.
Someone here can help by posting pics of the early and later versions so you can spot the differences
BTW- the inner mounting locations are different than what I assume these are intended for your Carrera ? The inner caliper castings have to be modified to fit the rear arms on your car. Costs about $400-500 for a machinist to do this

Thanks TRE! Luckily I checked and didn't order the same rears.
Yes I will be ordering new ones from Porsche, which will be later manufactured for sure. I don't know if I want to mess with the brake line inlets, maybe better off just wait it out for a little bit and see if porsche will make another batch of that caliper.

Yes, those will be for a carrera. I have had a set years ago, had to have the rear mounting machined also fins shaved down a little.

Thanks again!

[HarryD]

If it was me, I would reach out to PMB ti see if they can help you.

[Bill Verburg]

Originally Posted by Abby3.2Carrera

Thanks TRE! Luckily I checked and didn't order the same rears.
Yes I will be ordering new ones from Porsche, which will be later manufactured for sure. I don't know if I want to mess with the brake line inlets, maybe better off just wait it out for a little bit and see if porsche will make another batch of that caliper.

Yes, those will be for a carrera. I have had a set years ago, had to have the rear mounting machined also fins shaved down a little.

Thanks again!

If it were me I'd get the 930s from Elephant Racing, simple bolt on, no muss, no fuss no machining

Here's what TRE was talking about
This is a stock '87 up inner inlet


It would need to be modified like this for use on a 911 + the usual 3.5 to 3.0 mount mods

[Abby3.2Carrera]

Originally Posted by Bill Verburg

If it were me I'd get the 930s from Elephant Racing, simple bolt on, no muss, no fuss no machining

Here's what TRE was talking about
This is a stock '87 up inner inlet


It would need to be modified like this for use on a 911 + the usual 3.5 to 3.0 mount mods

Thanks Bill and Harry!
I think I will wait it out for a couple of months to see if the right rear becomes available from porsche.

[gomezoneill]

ALWAYS replace them in pairs. This is your brakes we're talking about.

[Arlo911]

The calipers have been out of stock for some time now. But if you buy the SCRS caliper mounts for the rears you should be OK when it comes to the brake line and for mounting to your Carrera rear arms. Last time I checked the parts were still available from Freisinger, and I think Mittelmotor stocks them too.

EDIT: I just checked and front and rear calipers both left and right seem to be in stock here in Europe.

[Bill Verburg]

Originally Posted by Arlo911

The calipers have been out of stock for some time now. But if you buy the SCRS caliper mounts for the rears you should be OK when it comes to the brake line and for mounting to your Carrera rear arms. Last time I checked the parts were still available from Freisinger, and I think Mittelmotor stocks them too.
......

SC/RS used exactly the same brake calipers and rotors on the same trailing arms as all other 930s for the 1983-1985 MYs

The only thing different was the twin master cylinder w/ balance bar setup

Again why would anyone want to but the factory parts then pay a bunch to mod them when the Elephant parts are a pure bolt on and just as effective

[Arlo911]

Originally Posted by Bill Verburg

SC/RS used exactly the same brake calipers and rotors on the same trailing arms as all other 930s for the 1983-1985 MYs

The only thing different was the twin master cylinder w/ balance bar setup

Again why would anyone want to but the factory parts then pay a bunch to mod them when the Elephant parts are a pure bolt on and just as effective

All I know for a fact is that the rear 930 calipers are a straight bolt on for Carrera and SC trailing arms without machining when using the SC RS (Group 4) caliper "halves"...

And I guess people tend to use factory parts mostly for homologation purposes in rally over here in Europe.

[Bill Verburg]

Originally Posted by Arlo911

All I know for a fact is that the rear 930 calipers are a straight bolt on for Carrera and SC trailing arms without machining when using the SC RS (Group 4) caliper "halves"...

And I guess people tend to use factory parts mostly for homologation purposes in rally over here in Europe.

Your definition of a 'fact' and mine appear to be quite different

from the 930 parts book rear 930 inner part # 930.352.951.01 or .02

from the 954 part book rear caliper inner part # 930.352.951.01

rear caliper w/p pads 930.352.091(2).01 for SC/RS .03 for 930

all of the above have the 3.5" axial 930 mounts not the 3.0" axial 911 mounts

trailing arm part #s 930.331.511(2).05 for both also w/ 3.5" axial mount holes

[GeorgeK]

FWIW I have seen and held in my hands rear 930 calipers with 3'' axial mounting ears, from the factory. They exist, of that I am positive.
Not a fan of countering Bill, but they do exist.
No I can't get to them again, and no I don't have part numbers.

[TRE Cup]

What you guys are referring to ,with the 3" center to center caliper, is a rare option that Porsche made available for the 911SC. At the time, if I recall correctly, it was a $8k option ! We were alerted to this option when we saw a factory poster with a guards red SC on it with the brakes. One of our lot was able to purchase these special inner caliper parts from Frau Behr at Werks 2 just to see if they would work for install on an aluminum trailing arm (NOT 930) . They did
Good luck finding these rare bits. (Freisinger ? $$$$$)

[Bill Verburg]

Originally Posted by TRE Cup

What you guys are referring to ,with the 3" center to center caliper, is a rare option that Porsche made available for the 911SC. At the time, if I recall correctly, it was a $8k option ! We were alerted to this option when we saw a factory poster with a guards red SC on it with the brakes. One of our lot was able to purchase these special inner caliper parts from Frau Behr at Werks 2 just to see if they would work for install on an aluminum trailing arm (NOT 930) . They did
Good luck finding these rare bits. (Freisinger ? $$$$$)

Ok so the skunk works had a few almost 1 offs

They were never, ever used or offered on SC/RS or any other non dream works car

[Arlo911]

Dear George, Dave, Bill.

I just received the parts from Freisinger, so the parts exist. I paid 450€ per side ex VAT and shipping. I'd rather use these than machine my calipers.

Are they reproductions, who knows?

They do carry a Porsche number, 911.352.540.00.

Now are these SC/RS parts? I guess not, my mistake. But neither are they one off skunkworks or 'dream' parts...

What I wanted to do is give the OP an answer to his problem, and help fellow Pelicans the way I've been helped countless times by using this forum.

These parts are marketed and known as SC/RS brake parts here in Europe, my guess is these were made around 1978 to homologate the 930 brakes for use on the Group 4 Rallye 911 SC, that came before the SC/RS. I think the misunderstanding comes from the fact that these would be RennSport parts, hence the SC/RS moniker. This is, of course, pure speculation on my part.

[GeorgeK]

Yup, had the same in my hands. Thanks for the reference images.

[Arlo911]

Originally Posted by GeorgeK

Yup, had the same in my hands. Thanks for the reference images.

No problem If any other pics/info are needed let me know.