My 06 silverado 2wd crew cab 1500 has been having some abs issues. What will happen is I will be driving the truck for a bit and I will get a warning chime like the one that happens if you don't buckle your seat belt. It may happen once or twice in a 10 min period then my ABS light will come on. Some times it flickers and goes off and some times it will stay on. I had a friend read the code with a tech 2 and it showed both front wheel sensors were setting the ABS light. I jacked the front end up and tried to move the front hubs but they seem tight. The truck has 56k miles on it. My friend says he has seen both sides go bad before. Before I drop a bunch of money on replacement sensors and hubs I was wondering if any one has had a similar problem or know what might be going on.