I have a 2007 Z71 4WD Silverado. Front brakes randomly lock up. Starts with a slow rub, I can feel the truck not accelerating like it should, and brake pedal stiffens a little. After a mile of driving 65 mph, 2-3 miles if I'm going 25-35 mph... Brakes completely lockup, truck won't move at all. Once it locks up completely, brake pedal is very stiff, takes a lot to depress it. Front wheels get really hot, back wheels feel normal. Brakes will break free after letting the truck sit for about 2 hours, and works fine after.
This happens sporadically, once every 2 weeks or so. Cant figure out what triggers it, happens driving down highway, back roads, wherever. Had the calipers, pads and brake fluid replaced 4 months ago. It was happening before then, so that didn't fix it.
Any thoughts on what might be causing this? Thanks in advance for any replies.
