[joyridin']

Those are Series 1 calipers and case. The pistons and housings unbolt from the frame with 4 bolts on each side. They would mount to a bracket and the bracket mounts to the bearing housing. You can usually unbolt the outer piston housing which will at least loosen the grip the pad has on the rotor. Then unbolt the frame from the mount, unhook the e-brake cables, then remove the caliper.

This style is getting a bit hard to find. They work well, but you have to have the calipers sleeved with stainless sleeves to make them durable. They came in a few sizes. If you loom on the outside of the housing it will tell you the piston size. Later version had larger pistons. Maybe 2-1/8” if I recall?