Question about calipers
 

How do I know what type of calipers are on my 75 911S? I have seen mention of an A-caliper as well as an S-caliper (might have the letters wrong)

oh andM-calipers as well.

check the spacing between the studs and try and stick a magnet to them. S calipers have a 3.5" spacing and a magnet won't stick to them. M calipers are the same spacing but are iron (the magnet will stick)

Not sure about the A calipers

S calipers are aluminum 3.5" spacing, thicker pad 13mm
M calipers (small) 3" spacing
A calipers 3.5 " spacing 10mm thick pad
Phil

thanks Phil,
I only really know the S calipers

http://forums.pelicanparts.com/showthread.php?s=&threadid=109524&highlight=M+cali per

Check here!