Antilock, Traction control, and Hill decent lights on?

I have a 2001 Disco and the ABS, TCS, Auto hill decent lights all came on together, I checked and the brake fluid was just a hair under the low mark so i topped it off and it had no effect on the lights. Any ideas?

I have a 2001 Disco and the ABS, TCS, Auto hill decent lights all came on together, I checked and the brake fluid was just a hair under the low mark so i topped it off and it had no effect on the lights. Any ideas?

check the abs sensors and wires at the wheels.

How do you check the sensor to see if its ok?

It was a wheel speed sensor, Right Rear to be exact. $300 for diagnostic, parts and repair!