I just got new tires put on my 2005 Dodge Ram 1500 4X4 and within a few days the ABS light and Brake light come on, but only when I reach about 50mph. When I turn off the ignition and turn it back off the lights are out until I hit about 50mph again. Any ideas?

I also recently realized that when I put the truck in cruise control it slightly bucks between accelerating and decelerating, definitely not a smooth ride like it used to be before this ABS light problem. The truck seems fine when I don't use the cruise control, no bucking at all.