66 Dart Front Brakes Question

I pulled a full Kelsey Hays 4-piston setup off a 66 Formula S that was in a yard in Colorado about 8 years ago. If you find a early A with Disc's thats a donor, its an simpler change-over. Spindles, Calipers, Rotors, dust shields, brake-line, proportioning valve(s) and master cylinder. This would also allow you to keep the same bolt pattern as on the back, probably small bolt pattern.

A lot of people prefer the change to the 5 on 4.5, which the 73-up single piston setup get you. Large bolt pattern has a much larger Rim selection. At which point an upgrade to the rear-end to an 8 3/4, or having the axles drilled&knurled and the drums drilled.