My front passenger caliper seized (single-pot) on my alltrac, to the point where it could hold me on a 10% slope. I decided to do the job properly and take both calipers off the front, strip to the bone, clean, replace as necessary and re-assemble. I did this. Nothing immediately wrong - slider pins a bit sticky and grease looked a bit baked so i stripped it totally and cleaned and regreased. All seals looked fine, all sliders clean and free. Pads have 5mm (min 1mm) though the side that seized has a cracked surface where it overheated. No problem, the back plate doesnt seem bent and ive had pads that were identical but with a slot machined in the friction material where the crack was so i finely sanded the surface of the pads off and re-assembled. Bled the calipers and even on the drive i found the same caliper held the wheel tight enough to let me torque up the wheel nuts fully. As suspected the same side seized before the end of the road - pedal firms up and loses effect.
Any ideas?