help! Brakes experts!

[Olivier]

Hi everybody!

i'm looking for some help, and possibly want to buy some parts if I can figure out what it is. If this thread is misplaced, please, move it to the right section.

I would like to identify what these brakes are and where I could find something similar. I can already tell you that these are porsche 906 brakes. i can also tell you that these on the pictures are probably not 100% as customers cars were AFAIK, only fitted with solid brake discs. maybe just a matter of spacer?

According to the 906 bible's, rear are supposed to have 38mm pistons, and front 44mm.

Book also refers as M and MS calipers, but my own knowledge ends here.

So here we go with the pics:

Rear:









Front:

[Olivier]

Front more pictures:









Any input greatly appreciated!

Olivier.

[72targa]

Olivier:

Once you get the technical help you need, by all means, post a WTB ad...

[davep]

Thanks for the thread. I've wanted to know more about the 906 brakes, but info is hard to find. The rears look similar to the 1967 911S rear calipers. The front calipers are a little odd. I don't recall 44mm pistons before. The 914/4 had 42mm front, and the 911 had 48mm front, and this fall nicely between. I'll get Eric onto this thread promptly. This is the wide L rear caliper from a 1967 911S:

[Olivier]

thanks at Targa72 for moving my thread.

davep: I already asked Eric (I think you are talking about Eric@PMB performance) I sent him some poctures a year ago, but not these ones. I also think he received the same pics from the owner of the car (I advised him to do so). He seems to be an living encyclopedia about P brakes! he even comented on the wrong nuts and bolts used on the pics I sent him.

unfortunatelly, so far I still don't have any definitive info.

If I'm not wrong, the calipers on your pics are made of steel, or cast iron. I think but not 100% sure, that 906 brakes are made of aluminium... And, the 906 parts catalog references them as "906 XXX XXX". The 911 parts kept their 901 XXX XXX parts numbers...
I begin to think that these brakes are VERY specific, and If I want to have some, my best chance would be to have some cast!

Still hoping the revelation... "hey! those are from an old Alfa romeo, or BMW..."

Thanks again for the answer.

Olivier.

[davep]

Can you post the photos that you did send to Eric please. I see now that they could be cast aluminum. The nuts on the through bolts are very wide; that is unusual.
It could well be a unique application. I'd love to see the transmission and brake pages from the 906 parts catalog.

[Olivier]

The pics I sent can be found on Freisinger's website. he restored a few 906's. Taka a look at the blue one, there are some good brake pictures.

What do you want to know about trans and brakes? Parts catalog is "only" a bunch of references. Unfortunatelly, no illustrations. Anyway, if you want something specific, PM me.

Olivier.

[chris_seven]

Olivier,

How confident are you that these calipers and manufactured from an Aliminium Alloy ?

The surface finish looks very much like a green sand casting and is typical of the type of finish you would expect on Grade 12 or Grade 17 Cast Irons.

Steel castings were also relatively rare in the mid Sixties.

I believe that ATE Calipers were generally based on Girling designs with ATE having a licence to use this technology and the photos are typical of this style of caliper.

If you look at the 908 style aluminium calipers on Eleven parts website and one of the 906s featured on the Freisinger site you will see the more typical die cast finish of the early Aluminium calipers of the period.

These calipers didn't use a split design but were one piece and bored through with a blanking plug and resembled the Girling AR, BR and CR designs (http://www.lotustalk.com/forums/f95/...alipers-88269/) and were similar to the '69S calipers.

The surface colour also looks similar to a sheradized finish which is an alternative and traditional method for appying zinc to components that will see extremes of weather. It is much more expensive a system to electroplating but give much greater long term durability.

[Olivier]

Hi Chris and thanks for participating in!

I agree this finish has something "bizzard" (strange).

From several sources, the calipers (originals) are made out of Al. If Gumpa comes here, he could confirm. Seen it on his website, under completed projects/ page 2, the last 906 he restored shows some great pictures of these brakes...

Will take a look later on the link sent.
Regarding the 908 brakes, Eric from PMB perf. explained it rather well (but don't remember where???) that these calipers are very, very close to the production S's alloy calipers.
Unfortunatelly, it seems that 99% of 906's cars is 906 specific (exepted for a few nuts and bolts, but even in this area, nothing is less sure...) I placed an add a few months ago, for some special ball joints I had redone, because, they were impossible to fing anywhere... Same story for the oil filters, same for the uprights, same for, and for....

If anybody else has a 906 replica project, please, save your money and time! Ask me how I know!

by the way, Chris, what are those parts? Wiper????????
Olivier.

[jdj123]

olivier,

when looking at the 906 owner's manual that I have, I noted that the brake disks are not vented but identical to the earlu 911 ones (65/66) and of course the calipers are not M or MS type.
Don't you think that the calipers pics that you show are 908 ones and not906 ones, I have a doubt.
regards,
JD