There are 3 sizes of multi piece, 4 piston, Brembo caliper used on all Porsches
Small
Medium large
Large
They come in 2 different configurations for mounting
Leading
Trailing
They come in 2 different mounting styles
Axial
Radial
The come w/ different piston sizes.
The n/a, non RS, 964 are all small, leading, axial mounts- front 36/40, rear 28/30
944t, 951, 968, 928 and 993 used different versions of hese calipers.
I don't recall if the Audi used the small 964 calipers as described above or the medium large 928S4/993 front 36/44
964 Smalls
965 small rear and medium large front
993 small rear(axial mount) medium large front(radial mount)
