[cobinder]

I have the caddy calipers on my 14b and they work great. The piston on the gm fronts are 3" the caddy's are 2'3/8". They both use the same pads.

In theory if you have the same calipers in all four corners either you set the proportioning valve to work best for the front or the rear, it can't do both.

70% of the stopping force is in the front brakes. If your front brakes are working strong then the rears using the same calipers will be locking up and working too hard when you stop.

For a proper system the rear brakes need to be somewhat less powerful then the fronts.

Two key additional parts of the system are a four disc MC and an adjustable proportioning valve. Without these two components you have reengineered your braking system and now you have no way to adjust it.

FYI I swapped my calipers so they are still up above the axle but now they are in front of the axle. This allowed me to modify the e-brake arms so the e brake cable runs up closer to the bottom of the leaf springs. Much less chance of getting them caught on underbrush when off roading.