Hello, I have 09 3500, I been having a problem with the front brakes engaging while driving without touching the brakes. The severity of how much pressure is applied varies. Today while stopped at a red light the front tires completely locked up to the point that I could not move the vehicle. Pumping the brake pedal while moving or stopping does nothing to correct the issue. I have already changed both front calipers, brakes, rotors, and flushed the system to no unveil. The reason I believe its some sort of sensor is I can hear a click with immediate release of the front brakes. I am not familiar with ABS or any other sensors that are in the braking system. Any help at this point would be great because I am totally lost now.