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On the 964 front caliper (36/40mm pistons), the retaining pad needs to be ground off a bit to fit the 1.25" wide rotor (28mm stock). I used 2-piston 964 calipers (44mm pistons) on the rear to give a hydraulic F/R ratio of 1.5. The rear calipers need to be hogged out also to fit over a stock 930 rear rotor and the mounting holes need to be relocated. The rears fit under 15" wheels with a 3mm spacer. The 2 piston 964 rears give more rear bias than the 4 piston 964 rear calipers (28/30mm pistons). A carrera rear caliper (42mm pistons) would give a HBR of 1.64. The only minor drawback with the rear 2 piston 964 caliper is a more limited pad selection. I've used Porterfield R4 which worked well. Now I'm using Raybestos ST43 that was a custom pad Porterfield made to fit the 2P 964 rear caliper.
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Rick
1978 911SC
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