help me identify these calipers please

[andre1511]

Hello fellow pelicans,

I just purchased a lot of Porsche parts from an old mechanic that is going into retirement and I found these calipers (see pics)



They are very light and the magnet doesn't stick to them, so they must be aluminium I suppose... but I already have a pair of aluminium calipers from a 2.4S and they don't look the same...

Can some of you guys help me in the identification?

[pors1968]

69-77 S caliper alu

[andre1511]

Are you sure?

[pors1968]

They look like ate.Look like 3.5 spacing They are two desing look on S but the best person for it is BILL VERDURG but to they look like.

[pors1968]

Ok my mistake the back for caliper is 4 bolt for banjo brake line .

[74-911]

Originally Posted by pors1968

69-77 S caliper alu

I don't know what they are but they are definitely not "S" calipers.

[djpateman]

They are ATE manufacture, look to be aluminum, but I do not know of any Porsche application.
They are bolt together halves, and fairly narrow, so designed for solid rotors. These would be for cars in the 1960's. Perhaps Eric at PMB performance would have better info. It would be useful to ask the mechanic if they came from a race car.

[andre1511]

Thanks guys for your help.

I am convinced they are not S calipers... Since I haven't seen anything like that on any S before...

The workshop where the old mechanic is working was the cove of a small racing team (scuderia in italian) and it is full of old weird stuff...

Probably these calipers weren't born as Porsche but they might had been used for racing purposes before being forgotten on a shelf.

I think I will keep them as an archeological racing discovery : )

[andre1511]

Hi again guys...

I just found these on an old thread

914World.com > Calipers from another mid-engined Porsche...

the calipers are the same as mine and it seems they are 906 aluminium racing calipers........

Can someone confirm that?

[Flieger]

I think the 906 used S calipers on front and rear. I know S calipers are not made in halves, so you do not have S calipers.

They are similar to the Aluminum M calipers that Eric at PMB is now selling.

[Bill Verburg]

Originally Posted by Flieger

I think the 906 used S calipers on front and rear. I know S calipers are not made in halves, so you do not have S calipers.

They are similar to the Aluminum M calipers that Eric at PMB is now selling.

Info is scarce but 904 and 906 used the same brakes

904 added backing plates for street use

they started w/ 10.5mm solid rotors and eventually changed to 12.7mm(the thicker disks lowered rotor temps by 70 °C

iron calipers except aluminum for the works cars when entered in the prototype classes, 35mm rear pistons(they tried 33mm rears but bias was too far off), originally 45mm front pistons later changed to 48mm to improve bias, originally twin 7/8" mc later changed to one 3/4"from a street 356C

they struggled mightily w/ rotor temps and pedal feel and bias

[andre1511]

I sent an enquiry to Gunnar racing and just got a reply from them.

They said they can be 906... For sure they are not 908 or 917...

[djpateman]

My gut feel is they are 906. If Eric says they are, then I would tend to agree.

[stephers]

These look like Alfa Romeo Milano calipers, some of them were aluminum ATE calipers that were very similiar to the " S " calipers but way cheaper.