Thankyou Jonathon. Thats great advice. A true gent. Vas.

The front calipers won't just bolt on the rear, you have to use parts from both to make them fit. I'm not sure whether you can make a pair of 993C4 rear calipers fit, it will no doubt be possible, just how much work..... That way you have a full set of 930 brakes to sell on, and they fetch good money too! Instead of a box of parts left like i do
We didn't do anything with brake bias, the balance just works.... As it no doubt would using 993 C4 front and rear.
Happy to help

Thank you for your help. This sounds like a great idea. May I ask why not just put the front caliper on the rear, or is the fit an issue? do you use anything to control the f/r bias? Sorry for all the questions and thanks again. Vas.

Hi Vas
It is so long ago i cannot remember what the standard set up felt like anymore, but i do remember it feeling a lot stronger slowing down when i had the conversion done! The front calipers are the silver 993 C4 ones, and the use of an adapter braket, no machining required. I am told that the pad size for these is very very close to the size of the 993tt big red fronts, but you get to keep the stock 930 disks.... And as you say they fit very snug behind the stock wheels.
You then take the front calipers, and fit the pistons bodies into the rear calipers. It's pretty simple to do, and it means everything fits without issue.
The brake bias works well, the car stops very very well, solid and steady even from 190mph! I'm very happy with it!
Regards
Jonathan

Hi Jonathon. Vas from Australia. I was interested to read your break set up recently. I have a 1979 930 that I would like to maintain my original 16 inch wheels. Looking around, I have not been able to find a suitable brake upgrade until coming across your post. Would you be as kind to give some details on your set up and the performance improvement you feel has been achieved. Thank you for your time. Vas930.