Ok, so I got a complete brake job on the rear end of my car and also a new wheel bearing and outer tie rod end on the front. I get the car back from my mechanic and now my ABS and brake light are on constantly. Anyone have any ideas on what this could be? Would any solutions be a simple fix I could do with hand tools in the parking lot of my campus?

 

It sounds to me like your mechanic probably screwed up one of your wheel speed sensors when he did the wheel bearing. Get the codes pulled and it will tell you if ones not working.
How do I know this you ask? I have one on the left rear that got screwed up and it shows up in the codes.

Good Luck...

 

How do you go about pulling the codes, if I may ask? I have the same problem, though my ABS light randomly shuts off and returns as soon as the car is on the move.