So far what I have learned, is that the four piston calipers can be easily mounted if you swap out the caliper backing plate. So far the only place that seems to have this backing plate is CVI, but I am sure that others have the part. I think that the part number (from CVI anyway) is 668333/34 left/right. As for the dual circuit master cylinder, IDP has the correct unit WS5A1003 for $138.00, and Scandcar Volvo has the master cylinder for 153.74 euros + S&H.

As mentioned in another post, the easiest dual circuit system to create is to install the dual circuit master cylinder and route the front brake line directly to the front chamber of the master cylinder. The rear brake line will remain as is and go to the rear chamer of the master cylinder. Total cost of conversion will be about $150-$200.

I am now getting together the information for the prefered dual circuit system that allows both front brakes and one rear brake per circuit. This design is prefered as it is much safer. I will report all my findings and costs here as soon as I have them.

Oliver
66 1800S