Join Date: Jan 2005
Location: The Netherlands
County: Zuid Holland
as the abs unit calculates speed/distance, I would imagine it uses all 4 sensors to arrive at an accurate value, otherwise you get errors driving through corners etc. It also makes a distinction between driven and non-driven wheels.
If all 4 sensors were defective, yes, you wouldn't get a speed/distance value, but a number of other things would of course also go wrong. Besides having no ABS, you would f.i. also have no braking-force distribution between front/rear, as this is also handled by the ABS.....