About ABS strategy.

ABS knows all wheel speeds, vehicle speed. When you press brake pedal ABS turns pump on and if wheel speed immidiatly stops ABS with modulator valve decreases pressure till wheel start rotating valves opens increasing pressure till next wheel lock.

If wheels dont lock ABS does nothing (but when brake pedal is pressed pump is on and ABS is ready to work).

Ranger has 3s/3m system, it means, that Ranger 3 sensors (2 on front axe and VSS) and 3 modulating valves - 3 bracke channels.

When both the rear wheels stops ABS decreases pressure in its line.

BUT ABS STOPS WORKING when sped is lower then lower limit (usually 2-5MPH) and last foot wheels skids usually.

I'm not sure what brand is Ranger ABS, but seems to me ATE (F87A-2C219-AB) ore Bosch 3S/3M.

New Explores presented in Europe has Bosch 4S/4M ABS with brake assist (r) ore with ESP...
4S/4M has traction controll function. When one speed skids ABS applies brakes and works loke self lockind differential....