Disk brake upgrade

‘76 Dart would have the 10.95” rotors and the larger 2.75” piston calipers.

You can add the 11.75” rotors by just buying new rotors and the 11.75” caliper brackets, and those will still fit with 15” rims. It’s a decent improvement in braking force with just the larger rotors. DoctorDiff has everything you need.

Wilwood 4 piston calipers have less clamp force than the 2.75” piston slider calipers. It’s a hard comparison because of the multi-piston and fixed vs slider caliper arrangement and efficiency losses. But 4 piston Wilwood calipers are not a slam dunk improvement.