When the brakes lock up, is it both sides?
Do the brake stay locked up?
Does this only occur after you have been driving foir awile?
Please let me know...Thanks, Carguyjosh
What is VERY common on these trucks is brake hose and caliper failures..
What you can do is when the brakes do lock, pull a front wheel off and open the bleeder screw.
If the brake caliper releases and the wheel will turn again, the hose is at fault..
If the caliper does not release and you can still not turn the wheel, the caliper is at fault...
If you are just wanting to be sure that the failure does not occur again, I'd just replace the calipers and hoses.
I have never seen anything else cause this problem on these trucks....
If you tapped it with a hammer to make it release....Its JUNK....
I'd replace both the left and right calipers and from your diagnosis, you'll be all set...