Recently bought a used '92 Previa LE 2WD. New to the Forum. First Japanese vehicle I've owned. Have to say that we do enjoy driving the "Bubble Van", although the styling is not up to the new ones, (neither is the price) but it does seem to have a niche. Can't say I've heard of a non-ABS 4 Wheel disc, but I would suggest you inspect all discs/calipers for free movement on the pins (sliding bushing) that allow the caliper assembly to "float". You should be able to slide the caliper freely along these pins.