Why would anyone want to turn the ABS off? I suppose on gravel locking the wheels might create a wedge in front of the tyre that may reduce stopping distances.
There were times with early ABS systems on artic trailers i wished it could be turned off, they were slow reacting to cut the brakes but even slower to re-apply them, imagine approaching a junction at a gentle pace, you're down to say 10mph and touch the brakes to bring the vehicle to a final halt, empty trailer with a not terribly efficient load sensing valve so despite gentle application a wheel slips...cue ABS releasing the trailer brakes and not re-applying them for probably a couple of seconds, during which time you either have to stand on the brakes to let the tractor unit alons stop the truck or keep the pressure steady and hope the brakes re-engage before you roll out onto the junction.
There have been times in cars in poor snow/ice conditions when ABS has made things worse rather than better, like its stablemate TC/ASR.
Short of pulling the appropriate fuse or relay i've not come across an ABS that could be turned off, on some vehicles you can't even switch AEBS off despite that being far from sorted in too many situations.
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