I was told they are off an 85, 911 here are the photos of the markings.

Any ideas as to what they are S or M or what how do I tell

forgot this side

Larry....Porsche doesn't put part numbers on their calipers for the most part, except for some Brembos.

If the spacing is 3.5"....they would be "M" more than likely....The only "S" calipers I know of are aluminum.

Shoot an image of the top too!

Isn't m 3 inch... a and s 3.5?

Damn Krauts...can't they follow the alphabet ?

You're prolly correct...........

Somewhere in the mid late 70's I thought everything went to 3.5" Those look like carrera front calipers. Which I believe would need a thicker rotor.

QUOTE (SLITS @ Dec 30 2005, 11:59 AM)

If the spacing is 3.5"....they would be "M" more than likely....The only "S" calipers I know of are aluminum. Shoot an image of the top too!

Here is the top. they are not alum. I checked with a magnet.

view of the bot.

I do know they dont open up enough for these rotors

Well, you really need to provide some dimensions: bolt hole spacing, length of pad and width between the pistons. Even the width between the pads will help.

They look like an A caliper which is a cast iron S size. I don't recall the brake line inlet there though.

I was just going to post about the inlet for the brake line. I havent seen a 911 caliper that connects in that fashion. But then I havent seen all iterations of 911 calipers.

Those are A-Calipers. 3.5" spacing and steel (cast iron, sorry Dave)

And... that would have been the correct caliper for what they said they came off.

QUOTE (Eric_Shea @ Dec 30 2005, 09:20 PM)

Those are A-Calipers. 3.5" spacing and steel (cast iron, sorry Dave) And... that would have been the correct caliper for what they said they came off.

Thanks Eric

Yep 3.5 space sorry I forgot to put that in here. Wanted to be sure I got what I was supposed to get.