Traction Control and Anti-Lock lights

I just had my front brake pads and rotors replaced on my 99 Aurora. Unfortunately, both my traction control and anit-lock brake dash lights are continually on. Any ideas what might be causing this? Thanks in advance.

I have exactly the same problem on my 97, any advice would be GREATLY appreciated. Thanks!

The wheel speed sensors are integrated with the wheel bearings. Remove the front wheels and check the connectors and wires.