I installed Scott's kit 4 piston Willwood and extra Willwood parking brake on stock rear disks and use vented disks and stock calipers/Gierling in the front.
- the 4 pistons Willwood's are on the forward ear, they are a good fit on 10" 15" Campies
- Park brake on the rear ear. The park brake is a swimming caliper I guess originally designed for motorcycle use (?). The adapter is steel, a bit to far out to accomodate the typically glued weights for the 15" rim. So had some issues. Best would be to rework the adapters by may be 2 mm closer to the disks (would require some welding and redrill (which I did not do). I needed to change to the very thin glued weights 2.5 grams (vs the typical 5 gram) each. Needed quite some for the 305 tires but it worked/s doing 75 grams!!.
- NO Prop valve
This is a top set up. Braking is adeqate for a 400 HP car. The Willwood park brake was just tested on the "rolling" test bench, with decent results. I got the very STRONG GERMAN TÜV/Mot approved, they also got me the brake change in the car paper work!!! So all offcial now.
Sorry I am expanding here a bit but tried to get the real set up I have by evidence.
Matthias