Well it is good you did fix it after you got / corrected the voltage output from the hub speed sensor..
back in the 1970's I began working on transportation vehicles that had a ABS system. so the sensors on the axles where adjustable and because they were not in a sealed area they got contaminated. the encoder wheel and the sensor collected iron dust that then caused the voltage to drop and the vehicle had to be brought into the repair facility..the operator had a switch that bypassed this ABS system so it could be operated at a higher speed to get back to the shop quickly..
this speed sensor stuff is magnetic so the greater the gap the less voltage.. and any rust in the hub will also drop the volts ..
greasing the hubs thru the sensor hole will reduce failures of the hub as this hub is not a sealed hub assy.. I just did a hub on a dodge challenger RWD.. hub was sealed. the speed sensor was outside of the hub but in a protected area. dodge called this encoder a sensor ring covered in a rubber material mounted on the axle .
never had any ABS issues with the dodge vehicles..
good luck and safe braking .....