OK just checked my rear brakes - they're good for a few more seasons, mechanically.
While fiddling with the brakes I checked the resistance of my rear ABS sensors - Got 1033 ohms on the rear left and 1023 on the rear right sensor.
Since I got nothing on the multimeter from either of the front wheel ABS sensors, I presume either I have a bad sensor or harness on each side. Seems rather weird and highly unlikely that both sides would go at the same time, doesn't it? Seems like there is no way of checking whether it is the sensors or the harnesses without having a sensor (quite expensive to buy since it's all part of the hub assembly) or a harness to splice in to replace the old one, but if it's not the harness I'd end up with an unnecessary splice, yikes. Do the splices need to be soldered or can the wires simply be twisted with a cap on the ends and electrical tape wrapped around the splice, i.e. does a twist connection provide reliable service?