Thread: Removing rear caliper. Remove ABS fuse relay?

I think ABS on three wheels is better than no ABS.

My understanding is that the ABS will only activate when braking, if the wheel (sensor) stops turning. That's not going to happen
if caliper removed.

You should be ok,
I had similar situation many years ago up north, 200 plus kilometers from nearest town. rear caliper seized.
First concern was overheating and warping the disk.
It was a D1 with no ABS, I forced pistons and pads away from disk with crowbar. (Hey, stuck in the bush 40 deg heat)
Then simply opened the brake bleeds on the rear and pumped the fluid out, so no rear brakes at all.
The front and back are on separate circuits, so I drove VERY carefully to town with only front.
NOT recommended if your towing.
surprisingly, I didn't notice any difference to the braking. Obviously, as I found later, both rear calipers were not functioning correctly anyway, and replaced.

I didn't think back then to just remove the caliper, lock the pads with some wood or whatever, as I didn't have a clamp anyway.

As said, 3 brakes are better than none.