Originally Posted by riethoven

It could also be blockage in the flexible brake lines that go to each wheel. They won't let the brake fluid back out of the caliper so the pads still have pressure against the rotor, which heats everything up and can cook the caliper. Feel the wheels after you have been out driving. If they are hot, that is where the problem is.

You could also have caliper pistons that are frozen in their bore. When is the last time you changed the pads? Did all the pistons push back into their bores without too much resistance?