The gen 1 rear discs are closer to a Starion style caliper.
The gen 2 are drum in disc, a much simpler caliper but the parking mechanism can have its own problems from moisture retention tightening the actuating arm on the brake shoe.

Yes the tread is standard rotation, give a push while you twist it. A little bit of lubricant on the pistons every few years can keep moisture out and keep things moving free.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.