Hello all

I am replacing the front disks on my S-30 early 72 with a new set of rotors I got from Amazon. I was putting things together with the hub/rotor assembly mounted onto the spindle, bearings set and torqued, the disk seemed to be 1/2 inch farther out then normal from the brake back cover. When I tried to install the caliper, it confirmed it. Like I said the bearings are properly seated and the spindle nut was in the right place with no visible problems and everything lined up.

Is there a difference in years and models of the front disk for the Z cars. Better yet, I would like to know the exact measurement of the disk shoulder(the hub mounting face and the rotor face) of a original set of rotors.

I think I got the wrong disks and just need that measurement to confirm it.

Thanks!

Polecat

Just measured mine from a 1970 Z 1.575" from the surface of the disc that the wheel bolts against to the surface that the pads ride against. I can give you other measurements if you want them.

I just did a quick check of the online catalogue and it shows a P/N change during the 240Z series (40206-E4100 --> 40206-E4101) but no effective date. Beginning in 08/1973 which should be the beginning of the '74 models of the 260Z the P/N went to 40206-N3100. Hope this helps resolve your question as to getting the correct parts.

motorsport shows the same part for all 240z years, but a different rotor for the '74-'78 260z/280z. perhaps that later fitment is what you ended up with...

That is the problem. The disks I have now, that measurement is 1.201 (30.5MM) it needs to be like yours, 1.574 (40MM). Thank you for taking that time to help!

Polecat

That helps and thanks!

Polecat

think that is the problem. A lot of online order places list the part for all years so little details like this gets missed.

Thanks again!

Polecat