So, my truck(01 Blazer LS) will sometimes have the ABS and parking brake light come on after a bump, and go out when I restart the vehicle. I've read about how the sensors on the hubs go bad so I wasn't too worried about the ABS light.

Today at random though just going down the road the SES, ABS and parking brake light all came on at the same time and wont go off even after turning the engine off and back on.

I was on my way to work so I can't get the code read until tomorrow morning when I get off, but I'm curious since they all came on at the same time if they can be related? I though all the SES light stuff was emmissions related?
Truck needs plugs, wires, cap rotor etc and I wouldn't be surprised if the egr valve needed to be cleaned but I wasn't prepared to see this.