For the truck in my sig I just have a few questions. I was running a little low on my brake fluid and I added some DOT 3 regulated brake fluid, and now whenever I get on the brakes I feel as if I have no working ABS and there is a sound of grinding that i get from the front. Could this be a worn down caliper making this noise or something else. I also know that the ABS is not working because we just got a good amount of snow the other day and I could lock up all four tires real easy under any bit of good pressure.

 

You can check your caliper pins to make sure they're sliding good.

 

Sounds like brake pad(s) worn out Not unsual that abs will not unlock brakes on ice due to extremelly low resistance of surface. JMHO