I have seen quite a few like this, mostly 3/4tons, but anyways you need to do what MrGoodwrench3 has said above, lube everything and make sure your pads are not binding were they slide on the caliper bracket. There is a known issue with corrosion due to dis-similar metals.

 

I turn a lot of rotors and see some kinda like that from time to time.

 

The pitting on my rotors is deeper than can be turned out. I will be buying new discs. Any suggestions on what brand and where to get them?

 

I would get some Power Slots, and either Hawk or EBC pads. Check out Summit Racing, Thunder Racing, or AutoAnything.

 

This is a link to the rotors that I think your truck uses, it is the place I bought the Cobalt rotors.

 

Those EBC UPR rotors are waaay cheaper on summit.

 

Sea salt and road salt are the number one causes of that. About all you can do is replace the rotors. If you try to turn them more often then not the metal just flakes off.

 

I didnt read the rest of this thread, but I just wanted to point out that not all the time will the ABS light throw a code.

My e-brake and ABS light come on everyday now for the last year.and has still yet to throw a code. I have had it checked like 5 times. The brake system on my truck is fine, I've narrowed it down to wheel speed sensors.....just havent spent the $60 a piece on them yet

 

Also, I have replaced the rotors on my vehicles a couple times, and have used O-reillys brand or whatever they had in stock....no issues and they were like $20 a piece. Cant go wrong there...

 

My ABS and brake lights are still coming on intermittently. It has not set a code that I can read with my cheapo Cen-tech code reader.
When I sanded down my front rotors, I cleaned off the sensors. It doesn't seem to have made any difference.
On top of that, I am due for a state vehicle inspection. With my luck, the lights will come on when they are testing my truck and they will fail me.