ABS and Brake Light On

[bostogrun]

I am beginning to get ABS and Brake Lights on a 1997 328i with 180k. I checked all four wheel speed sensors with a multimeter and got about 1.0 ohm resistence on each one but it's hard to know if these are accurate readings? Hard to get reach the connector pins in the deep jack. Any ideas about common culprits considering the mileage? The speedo is working OK so it's not the left rear wheel sensor.