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Posted by: Olympic 1.7 Aug 7 2013, 02:08 PM

I just got a front suspension off of a 76 911 that was being parted out. he told me it had a stock front end and what with just taking it off the car I didn't check the calipers closely... not that I would have been able to tell what they were anyway. .. the guy I bought them from was not the builder of the car, he just bought it at an insurance sale for some parts he needed for his 911 and was selling off the rest.
So I get them home and while cleaning everything up I decide to measure the bolt spacing and it is 3 1/2 ... I thought the 76 had the 3 in calipers. but with everything else that was changed / upgraded on this car I am not surprised.

So any of you brake gurus out there have an idea of what these calipers are?
Whatever they are I guess its what I will be using....

http://imageshack.us/photo/my-images/46/tyzm.jpg/

http://imageshack.us/photo/my-images/821/t3r3.jpg/

http://imageshack.us/photo/my-images/819/ef59.jpg/

Posted by: Vysoc Aug 7 2013, 02:46 PM

I think those are the "M" which would have been from 74 well into the SC's.
My 1980 911 SC had the same calipers, if they are not the "M" they are probably the "A".

I am sure Eric will weigh in and then we will all know.


FWIW.

Vysoc

Posted by: toolguy Aug 7 2013, 03:45 PM

M calipers are from 914-6 and 911T with 3 inch spacing. A calipers are 3.5. . the pad area for an M caliper is just about the same as a 914-4, but you gain vented rotors.

corrected. . thanks. .

Posted by: Dave_Darling Aug 7 2013, 04:17 PM

I think you have M and A reversed, there, toolguy.

There's no crossover; I remember S calipers having a crossover tube. (Or two?)

They look like steel. If a magnet sticks, they are. And that would mean they're A calipers.

--DD

Posted by: Olympic 1.7 Aug 7 2013, 04:57 PM

They are steel, the rotors are 20mm and the pads are much larger than my stock 914-4 calipers have.
They resemble this pic I took from a thread that Eric of PMB posted and showed as being A calipers,

http://imageshack.us/photo/my-images/687/o8el.jpg/

http://www.914world.com/bbs2/index.php?showtopic=105728

I also have the Boge struts, and after more research I am also leaning towards them being the A calipers, which are heavier but I guess they will do.....

Posted by: r_towle Aug 7 2013, 05:37 PM

They are the small yellow ones

Posted by: chad newton Aug 7 2013, 10:25 PM

They are a. I had to change my post. A's are steel 3.5.

Posted by: Eric_Shea Aug 8 2013, 06:28 AM

Big heavy A-Calipers. The heaviest caliper Porsche ever put on a 911. Basic sedan caliper of the day. To be found on Mercedes, BMW, Alfa, Ferrari and Porsches.

Early A-Calipers had three fluid inlets cast into the back half. Only the bottom one was tapped.

That's a much later suspension though. Notice the pad sensor tabs mounted to the strut tube.

Posted by: 914Sixer Aug 8 2013, 08:14 PM

Eric, nailed it as usual!


The quick spot on those A calipers is where the hard line comes in.

Posted by: pdlightning Aug 10 2013, 09:35 PM

Eric also nailed it when I got my rear V calipers from him. They are beautiful. Thanks Eric ,again!